A horizontal plastic waste recovering granulator is composed of a hopper, a box cover, a melting chamber, a fan, an arc-shaped screen, a heating tube, a mouth mold, a pelletizing mechanism, an extrusion screw, a machine cylinder, a frame, a driving mechanism, a transmission mechanism, a V-shaped receiving hopper, a hot air circulating box body, a separator plate and a stirring mechanism. The granulator adopts hot air to directly melt plastic wastes, so the crushing and cleaning processes of traditional technologies are omitted, the working environment is improved, and secondary pollution is avoided; and the temperature of the hot air is controllable, so the overheating decomposition of plastics is avoided, cycle use of the hot air is realized, and the heat efficiency is high.