Strip mine mountain blast hole wall protecting device

The utility model provides a protective wall device for a blast hole of a strip mine. The protective wall device comprises a fixing piece arranged at the position of the hole opening of the blast hole in a surrounding mode and a protective wall piece connected into the blast hole in a sleeved mode and matched with the fixing piece in a nested mode. The wall protecting piece is matched with the blocking piece, so that when the blocking piece is installed on the wall protecting piece, the blocking piece and the wall protecting piece are in interference fit, and the blast hole is protected. Loose rock soil around the upper part of the blast hole is prevented from sliding into the blast hole; the collapse of loose rock soil around the blast hole filling section is avoided; the problems of follow-up blasting and excavation and transportation caused by the fact that blockages fall off from the bottoms of the blast holes are solved; the device is simple in structure and can be repeatedly used, and residual values ca