Waste paper shredder, including the shredder main body, frame, feed inlet, hopper, shredding chamber, shredding device, conveyor belt, controller, crushing chamber, and crushing device. The feed inlet is located at the upper left of the shredder main body, with a hopper attached to it. The shredding chamber is situated below the feed inlet, and the shredding device is inside the shredding chamber, comprising a shredding motor, main shaft, shredding rollers, and a serrated housing. The main shaft is connected to the shredding motor, the shredding rollers are mounted on the main shaft, and the shredding rollers are enclosed by a serrated housing. Below the shredding chamber is a conveyor belt, which is connected to a conveyor motor located beneath it. The controller is positioned below the conveyor motor, and the crushing chamber is located to the left of the controller. The crushing device is inside the crushing chamber, consisting of a crushing motor above it, a crushing shaft, movable and fixed components, with the crushing shaft connected to the crushing motor.