The invention discloses plastic pelletizing equipment comprising a melting mechanism, a heating mechanism, a filtration mechanism and a plastic pelletizing mechanism. Waste plastic is introduced intothe melting mechanism to be molten, and impurities are filtered by introducing the waste plastic into the filtration mechanism. After the molten plastic forms a plastic cord through a cord extruder, the plastic cord enters a cooling pipeline, a liquid nitrogen generator drips liquid nitrogen into the cooling pipeline, the liquid nitrogen vaporizes to absorb a large amount of heat, and thus the plastic cord is cooled and set. The cooled plastic cord is conveyed to a pelletizer, the pelletizer conducts pelletizing, and plastic particles are formed. Through the design, after extruded, the plasticcord is kept in a dry state to be cooled, a small amount of liquid nitrogen can absorb a large amount of heat, the usage amount is small, the liquid nitrogen changes into gas after vaporizing, subsequent treatment is not needed, the plastic particles formed after pelletizing does not need drying operation, procedures are reduced, and energy is saved.