The invention discloses a crusher with functions of impact crushing and extrusion shearing crushing. The crusher comprises a motor, a housing, a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotor disc and a rotor pin, the stator assembly comprises a stator disc and a stator pin, the rotor pin and the stator pin comprise quadrangular prism-shaped steel billets, the front portions of tangential direction work surfaces of the rotor pin and the stator pin are standard zigzag surfaces, the end of the tangential direction work surface is provided with a first special-shaped zigzag, a width of the top portion of the first special-shaped zigzag is at least two times the width of the tooth bottom of an ordinary zigzag on the front portion of the tangential direction work surface, and an included angle formed by the tangential direction work surface of the stator pin / the rotor pin and a tangent surface of the prism surface A passing through the axis line of the stator pin / the rotor pin is more than or equal to 5 DEG and is less than or equal to 20 DEG. The crusher has characteristics of simple structure, high crushing rate, high crushing efficiency, low cost, small size, wide application range, simple operation, good sealing, less wearing parts, low auxiliary material consumption, high efficiency, and energy saving.