Since the 1970s, Marxist economists have noticed the reality of the expanding financial sector along with the economic stagnation. After the joint efforts of two generations of scholars, the monopoly capital school proposed a monopoly financial capital theory. Since the establishment of theory has experienced a long time, and there are intergenerational replacements of researchers, the ideas of different researchers in different periods are scattered in related papers and works. It is difficult for other the researchers to systematically and accurately understand their financialization theory. This paper will make full use of the text published by the school at different times, and trace the process of its theoretical development and evolution. According to the history of financialization and the evolution of the financialization theory of monopoly capital school, this paper will appropriately evaluates its contribution as much as possible.