The invention provides a game theory based gray haze monitoring and early warning system which comprises a government data acquisition unit, an enterprise data acquisition unit, a citizen data acquisition unit, a grey haze data acquisition unit, a server, a database, an early warning device, a PC, and a mobile terminal. The method is performed as follows. The server and the database integrate the government data acquisition, the enterprise data acquisition, the citizen data acquisition and the grey haze data acquisition. Through the use of the server and the database to analyze the tripartite game mechanism among the government, the enterprise and the citizen and the internal influence mechanism of different data, early warnings and reference to gray haze evolution and management can be made possible. The invention can also formulate different management strategies according to the situation of the tripartite game and observe the effect of the grey haze treatment with different treatment strategies. With the early warning device, the PC and the mobile terminal, the grey haze monitoring and early warning can be reported to a user.