At present, the sharing economy industry in our country is in the early stage of development. While it is booming, it also brings more regulatory problems, causing great troubles to consumers and the government. In view of the current regulatory difficulties of China's sharing industry, taking prevention of collusion as the key point, we propose the outsourcing strategy of sharing economy regulatory services,establish the dynamic evolutionary game model of sharing enterprises,third-party regulators and government departments,analyze the collusion behavior between sharing enterprises and third-party regulators, and the regulatory behavior of the government, and validate the results of the model through numerical simulation. The results show that the government's supervision intensity,punishment intensity, the disutility of the collusion between the third party and the sharing enterprise, and the cost of hard work have an impact on the collusion behavior. It is conducive to the healthy development of the sharing industry to increase the intensity of government supervision and punishment and urge third-party regulators and sharing enterprises to reduce the operating cost.