The impact crusher has secondary impact plate and tertiary impact plate, which can deal with materials below 100-800 mm in side length, and is suitable for crushing medium-hard materials with compressive strength of up to 350 MPa, relatively small size of discharged materials and good granularity of materials, which are in the form of cubic particles. The rotor parts are carefully made, the rotor dynamic and static balance is good, the machine runs smoothly and the noise is small.(Suitable for moderately hard raw materials)