In the country development tide of cultural tourism, the sharing of short-term rent industry came into being. Short-term rent sharing platforms not only bring convenience to tenants, but also choose the wrong means of colluding with landlords in order to occupy the market as a new industry, which seriously violates market discipline and damages the interests of users. By establishing a game model, the causes of collusion of short-term rent sharing was analyzed, and relevant principles and methods of institutional engineering was used to optimize the supervision system of collusion of short-term rent sharing in terms of observation intensity and punishment intensity, so as to provide countermeasures for the healthy development of short-term rent sharing industry.