The invention discloses an upward hole blasting blocking method and a corresponding blocking device. According to the method, by arranging a blocking body in a blast hole orifice, the blocking body istransversely limited through a locking column; and the blocking body and the locking column form crossed interlocking, explosive in a blast hole can be blocked off, blasting energy is blocked from rushing out of the blast hole, energy wasting is avoided, accordingly, blasting energy utilization can be improved, and the blasting effect is improved. The corresponding blocking device comprises the blocking body, a mounting rod, a locking rope, a transverse pin and the locking column, one end of the mounting rod is inserted into an axial blind hole in the blocking body in a clearance fit mode, the length of the transverse pin is greater than the hole diameter of the blast hole, the locking column and the mounting rod are arranged in a crossed mode, one end of the locking rope is fixed to themounting rod inserting end of the blocking body, the other end of the locking rope is fixed to the transverse pin, the length of the locking rope is greater than the distance between the blocking bodyand the blast hole orifice, the mounting rod pushes the blocking body into the blast hole and pulls the blocking body out of the blast hole, the locking rope can be wound on the locking column by rotating the locking column, and accordingly, the distance between the blocking body and the transverse pin is shortened until the transverse pin tightly abuts against the blast hole orifice.