Coal mining machine spiral drum capable of improving lump coal rate

The utility model discloses a coal mining machine spiral drum capable of improving lump coal rate, which comprises an adjusting assembly, the adjusting assembly comprises a drum core, blades, an end disc, a connecting seat, a first tooth holder, a second tooth holder, a screw rod, a moving rod, cutting teeth, a first gear, a second gear and a rotating rod; blades are welded to the outer side wall of the barrel core, an end disc is fixedly connected to the bottom of the barrel core, a plurality of connecting bases are welded to the outer side walls of the end disc and the blades, and first tooth bases are welded to one sides of the connecting bases. The rotary knob drives the second gear to rotate through the rotating rod, the second gear drives the first gear meshed with the second gear to rotate, then the first gear drives the moving rod to move through the screw, the moving rod drives the limiting block to slide on the L-shaped rod, the cutting teeth are driven to move through the moving rod, and therefore