Digital economy innovates labor forms and weakens the interpretation function of traditional economic dependent standards, which is no longer enough to support the judicial organs to define labor relations on platforms. As a result, the judicial confirmation of labor relations between platforms and workers falls into difficulty, and there exists a dilemma in protecting the rights and interests of workers on platforms with judicial relief. Although the traditional identification standard of subordination has been broken through, the labor nature of the combination of labor force and means of production has not changed in platforms' production process. Therefore, based on the perspective of Marxist political economics, we should explore the basic theory of labor dependent capital, construct the new era connotation of economic subordination through data information and algorithm technology, and make economic subordination become an important criterion for judicial organs to judge the existence of labor relations, so as to provide beneficial suggestions for protecting the labor rights and interests of vulnerable groups on the platform and realizing social substantive equality.