"Generation Z" youth is a generation growing up in the Internet. Therefore, in terms of their living field, they have the duality of network life and real life. Under the interweaving of network and reality, the youth of "Generation Z" show a dual mentality, which is mainly reflected in value identity, identity, social identity and emotional identity. The emergence of " dual mentality " makes them fall into the whirlpool of contradictions, resulting in identity obstacles and hindering the upward growth of "Generation Z" youth. The formation of the " dual mentality " of the "Generation Z" youth is closely related to the change of group cognition under the rapid social transformation, the rise and spread of network subculture, the replacement of the real field by cyberspace, and the abnormal development of the social interaction of the "Generation Z" youth. To resolve the " dual mentality " of "Generation Z" youth, it is necessary to correctly guide the value, grasp the network position to enhance the discourse power of the mainstream values, expand the scope of communication, attach importance to the educational role of social practice, and make high-quality social and cultural products to spread the mainstream culture and carry forward the positive force.