Abstract: The essence of political belief as a unique spiritual phenomenon of human culture is ideology. In this paper, political belief specifically refers to Marxist belief or Communist belief.Chinese Marxism is a process of Marxist belief in China. The article discussed the role of political belief in Marxism sinicization mainly from three aspects, namely, the firm political belief role in promoting the development of society, in guiding the party's the practice and construction, and in unifying the practice of the masses. It can be seen that the firm political belief is the spiritual weapon to promote the development of Chinese society; it is the spiritual pillar and guidelines to induct the party's practice and construction; it is ideological basis and spiritual bond to enhance people's cohesion.