Enhancing the mainstream ideological identity of young people is an unavoidable issue in the ideological construction of socialism with Chinese characteristics in the new era, which is closely related to strengthening the national identity and expanding the mainstream ideological positions. In this paper, we refer to the E-learning platform framework to design a Marxism online learning platform to achieve the online dissemination of Marxism and ideological education for youth. The HRNN model is utilized to extract and identify the behavioral traits of youth on the Marxism learning platform and investigate the link between youth behavior and ideological identity. The results of the study show that the Marxist online learning platform has a better communication effect and can improve the identification of the youth group with Marxist ideology. Meanwhile, the correlation analysis shows that there is a significant correlation between video viewing completion, quiz completion, and ideological identity (P=0.000), which is highly positive. The suggestions put forward in this paper regarding communication management, communication technology, and publicity provide a reference for further online communication of Marxism and lay the foundation for the enhancement of youth ideology education.