Blasting anti-holing device and blast hole blocking method

The invention discloses a blasting anti-holing device and a blast hole blocking method. The blasting anti-holing device comprises a rigid plug, a movable ejector rod and fixing pins, the rigid plug is installed at an orifice of a blast hole in a matched mode, the movable ejector rod is inserted into the rigid plug from the top of the rigid plug and can move up and down and rotate in the axial direction relative to the rigid plug, a first check block is fixedly arranged on the movable ejector rod, a positioning block matched with the first check block is fixedly arranged in the rigid plug, the fixing pins are arranged in rows in the axial direction of the rigid plug, each row comprises a plurality of fixing pins which are inclined downwards and outwards and are evenly arranged in the circumferential direction of the rigid plug, the side wall of the rigid plug is provided with through holes in one-to-one correspondence with the fixing pins, the middle of each fixing pin is hinged to the rigid plug, the tail end