Abstract: In order to solve the difficult situation of small and micro platform social responsibility governance, a new model of platform enterprise collaborative governance is proposed. Based on the evolutionary game theory, a tripartite game analysis model of large platform enterprises, small and micro platform enterprises and the government is constructed, and the evolutionary equilibrium law of the governance process revealed through solution and numerical simulation. The results show that when the governance of social responsibility issues of small and micro platforms is in evolutionary equilibrium, there are four combinations of evolutionary stability strategies. In order to put large platform enterprises and small and micro platforms in coordinated co-governance and the government in the equilibrium state of general supervision, it is necessary to meet the requirement that the tax subsidies given by the government to large platform enterprises are greater than the cost of their participation in governance; In the co-governance state, the benefits of governance are greater than those of non-governance, and the fines of non-governance are greater than the difference between the benefits of non-governance and governance. Therefore, the government should increase the tax subsidies of large platform enterprises and properly grasp the fines of small and micro platform enterprises. Both platform enterprises should strive to improve the benefits of collaborative governance, so as to realize the collaborative governance of corporate social responsibility of internet platforms, alleviate the responsibility problems of small and micro platform enterprises and solve the current situation of government supervision difficulties

Key words: collaborative governance, internet platform enterprises, corporate social responsibility, driving mechanism, evolutionary game