The invention relates to an antibacterial polycarbonate composite plastic granulation method. The method comprises the following steps of S1, classifying plastic; S2, crushing the plastic; S3, cleaning the plastic; S4, drying the plastics; S5, granulating the plastic; S6, conveying plastic particles; and S7, dicing the plastic particles. In the S1, the recycled polycarbonate composite plastic is classified and placed; in the S5, the dried plastic fragments are put into a hopper of a single-screw type granulator to be processed into plastic particles; and in the S6, the plastic particles are conveyed to a designated position and the plastic particles are collected under the cooperation of a conveyor belt and a blocking mechanism arranged on the conveyor belt. The method can solve the problems that the conveyor belt cannot be folded on the plastic particles in the transmission process of an existing conveyor belt, the plastic particles slide off the conveyor belt, the plastic particles are adhered to the conveyor belt in the conveying process, and the plastic particles cannot be overturned in the conveying process, so that the plastic particles with certain temperature are adhered together and the like.