The drum-type mulching film perforating device comprises a handle mechanism, a mounting frame and a perforating mechanism, the handle mechanism is fixedly connected with the middle position of the rear end of the mounting frame; bearings are arranged on two sides of the mounting frame; the bearing is detachably connected with the mounting frame; the two sides of the punching mechanism are rotationally connected with the two sides of the mounting frame through bearings; the punching mechanism is arranged on the mounting frame and can rotate by moving the mounting frame, the punching mechanism comprises a plurality of punching wheels and a rotating shaft, the punching wheels and the rotating shaft are detachably connected in a sleeving mode, the punching wheels are symmetrically distributedon the rotating shaft, and a plurality of wedge-shaped pieces are evenly arranged on the edges of the punching wheels so that the mulching film can be punched in the rotating process of the punching wheels. The multiple punching wheels can punch multiple rows of holes in the mulching film at the same time, the punching wheels are detachably connected with the rotating shaft, the punching wheels can be replaced conveniently, meanwhile, the distance between the punching wheels can be adjusted conveniently, and therefore the punching row spacing can be adjusted conveniently.