Abstract: The bonding behavior of liquid bridge in wet coal agglomeration is simulated by using the bonding particle model of discrete element method. The wet coal agglomeration model is constructed by using discrete element software EDEM and its secondary development. The collision behavior between the agglomeration and the flexible sieve plate is simulated.The rules of liquid bridge breakage of each part of agglomeration in collision process was studied. The effects of collision velocity, inclination angle of sieve plate and rotation velocity of agglomeration on the degree of depolymerization were analyzed.The results show that the breaking zone of the bond first occurs in the contact zone between the agglomeration and the screen surface, and then diffuses from the bottom to the top, from the center to the surrounding.After collision, the degree of Depolymerization increases with the increase of collision velocity and decreases with the increase of inclination angle of sieve plate, which is benefited frome the rotational speed of agglomeration.