In the "Internet +" era, national cultural innovation has entered a new stage of national culture construction. The core of national cultural innovation lies in national culture, which is a cultural concept universally acknowledged in the developed countries since the end of WWII. As an important basis of a state’s international recognition, it grows with the formation of the "nation-state" concept and represents a specific manifestation of the national image. To improve the soft power of national culture, in the final analysis, efforts must be made to promote national cultural innovation, where the key is how to transform different cultural resources to enrich the national cultural system. The national cultural innovation has three characteristics: the first is that the transformation and development of the traditional culture are promoted simultaneously, so that in the "Internet +" era, the traditional culture has shown a new charm and become an important resource of national cultural innovation; the second is to absorb foreign cultures while discarding the dregs, where to absorb means taking in the contents that conform to China's national conditions and have a positive influence in foreign cultures while removing the components not suitable for Chinese politics, morals, religions and other specific national conditions at all; the third is to inherit and discriminate the revolutionary culture, while absorbing and inheriting the revolutionary culture. It requires effective promotion of it in a discriminating manner, to screen the revolutionary culture with the help of fast and efficient information transmission in the "Internet +" era, so that it is at the service of the national cultural innovation and grows into a cultural form with influence, identity and dissemination value around the world. Because the national culture is generally expressed in the form of language, the national cultural innovation comes into a close relationship with the national language security. Firstly, in the "Internet +" era, the promotion of national cultural innovation must go with the maintenance of national language security, as safeguarded national language security is the basis for the promotion of national cultural innovation. At present, the problems in national language security have been highlighted and presented mainly in three aspects: the first is that a large number of foreign and Internet words are flooded in the mother tongue, leading to the emergence of an "Internet language"; the second is that in the "Internet +" era, faster information dissemination exacerbates invasion of the mother tongue by foreign languages; the third is that the whole society fails to pay enough attention to the national language security, and the national language security problem becomes increasingly prominent with rapid development of the Internet technology. Secondly, in the "Internet +" era, the national cultural innovation must be in keeping with the national language security, so as to achieve a multiplier effect. National cultural innovation is to build and disseminate the national culture with new ideas by new means and new ways in the "Internet +" era, thus producing internal cohesion and making an impact externally. But all this must be done in tandem with the maintenance of national language security. The above is the core of this study. To correctly cope with the relationship between national cultural innovation and national language security, it is required to combine the cultural confidence with the national cultural innovation organically, to prevent the operation and understanding from stepping into two misunderstandings, namely, cultural isolationism and language hegemonism, which is the innovation of this study. Cultural isolationism is a cultural symptom caused by cultural inferiority. In the modern "nation-state" context, the degree of cultural confidence reflects the level of national cultural innovation. Cultural isolationism binds the development of the national cultural innovation, while bringing the cultural symptom of cultural arrogance as a result of language hegemonism. Specifically, it is required to prevent other countries from promoting their state or national languages in China and avoid holding a double standard to language hegemonism, so as to prevent the national cultural innovation work from being dogmatic, vulgar and quick profit oriented. Therefore, the establishment of cultural confidence is an important means to break cultural isolationism and language hegemonism.