The invention discloses a coagulation phenomenon simulation method based on a particle model. The method includes the steps that 1, discrete modeling is conducted on the phenomenon that gas coagulates on the solid surface, wherein the influence of the dew point temperature and the relative humidity property in a humidity diffusion model on the details of the coagulation phenomenon is considered; 2, a soil-liquid coupled boundary density correction algorithm is proposed, the problem of particle loss of a smoothed-particle hydrodynamics model at the boundary is solved, and meanwhile particle penetration is prevented under the condition that the time step is not decreased; 3, a particle system is used for conducting discrete modeling on air, the simulation process can be expressed more visually, and adjustment and design can be conducted easily. By applying the method, the flow property, heat conduction property and the like of air can be conveniently adjusted, and the problems that existing air heat exchange phenomenon simulation is not visual in effect and lacks enough details are solved; the method has certain practical value.