The invention provides an efficient crushing method special for a coal mine. The crushing device includes a bottom plate, a supporting plate, a bracket device, a comminuting device, a cleaning deviceand a propelling device. A recovery box, a first bending rod, a first supporting rod, a second supporting rod, a first cross rod and a third supporting rod are arranged on the bottom plate. A first bending plate, a first cylinder, a first push rod, a first positioning frame, a first bracket, a first inclined rod, a second cross rod and a first supporting block are arranged on the supporting plate.The bracket device comprises a second bracket, a third bracket, a first filter screen, a first sponge block, a third cross rod and a positioning ring. The comminuting device comprises a second cylinder, a second push rod, a frame body, a roller, a comminuting tooth and a spring. The cleaning device includes a pipe, a fan and a fourth bracket. The propelling device comprises a third cylinder, a third push rod, a push plate, a transverse plate, a second inclined rod, a fifth bracket, a sixth bracket and a seventh bracket. Coal mines are comminuted in batches and continuously.