"Metaverse" represents the new trend of the future development of science and technology. Its emergence is accompanied by the development of digital economy and the innovation of technical content. The alienation and evolution of technology has quietly taken place under the expansion of its ecological territory, that is, cultural imperialism grasps and controls the "information truth" in the pseudo-environment of "Metaverse", thus carrying out cultural aggression and infiltration. In the pseudo-environment based on the technological media of "Metaverse", cultural imperialism can "savagely grow" covertly by its interwoven space-time field, which is essentially the output of western ideology such as values, leadership and discourse right that transcend technology and attach to it. On the one hand, this kind of cultural "homogeneity" output continuously weakens the mainstream cultural identity of the nation-state; on the other hand, it intensifies social differentiation and interpersonal barriers. At the same time, as the main output source of "Metaverse", the immersion experience and "unlimited" freedom of youth community are dominating the alienation trend of youth core value identity.