The invention provides a rotary tooth type crusher. The rotary tooth type crusher comprises a crushing cavity, a drum-shaped gear coupling, a speed reducer, a hydraulic coupler, a motor and a base, wherein the crushing cavity, the drum-shaped gear coupling, the speed reducer, the hydraulic coupler and the motor are sequentially connected and then are arranged on the base; the crushing cavity comprises an upper crushing cavity body and a lower crushing cavity body; the upper crushing cavity body is arranged on the lower crushing cavity body; and rotary tooth spindles are arranged inside the crushing cavity and comprise the left-handed spindle assembly and the right-handed spindle assembly which are arranged inside the crushing cavity in parallel in an overlapped mode. The main work components are the two parallel rotary tooth spindles comprising the left-handed spindle assembly and the right-handed spindle assembly, the volume compression principle is adopted, multiple supporting points generate force on materials, that is, the materials are crushed through common action of shearing, bending and partial extrusion, and high efficiency and energy conservation are achieved.