The invention relates to the field of crusher devices, in particular to a modular impact crusher convenient to maintain. The modular impact crusher comprises a base, a rotor part is arranged on the base, a front frame and a rear frame are arranged on the two sides of the rotor part, a front inspection door is arranged between the front frame and the rear frame, rear inspection doors are arranged on the two side faces of the rear frame respectively, an upper inspection door is arranged between the tops of the front frame and the rear frame, and a lower inspection door is arranged on the side face, away from the front frame, of the rear frame. At least two hinge shaft bases I are arranged on a transverse beam I of the front frame, the front end of an upper impact rack is arranged in the hinge shaft bases I, an upper adjusting device is arranged in a U-shaped groove of an upper transverse beam of the rear frame, the front end of a lower impact rack is arranged in hinge shaft bases II, anda lower adjusting device is arranged in a U-shaped groove of a lower transverse beam. Each hinge shaft base comprises a fixing hinge shaft base body and a press cover which are in butted connection up and down. According to the modular impact crusher, a damaged lateral lining plate and a damaged flat hammer can be replaced on the outer side of a cabin, the maintenance way of the impact crusher ischanged, and the maintenance difficulty is reduced.