Folding safety protection shed frame in tunnel hole

The folding safety protection shed frame in the tunnel hole comprises an upper steel plate, rotating plates are arranged on the left side and the right side of the top end of the upper steel plate, a left steel plate is arranged at the bottom ends of the left sides of the rotating plates, and a plurality of third bolts are evenly and fixedly connected to the top ends of the rotating plates. The bottom end of the right side of the rotating plate is fixedly connected to the top end of an upper steel plate through a third bolt, the bottom end of the left side of the rotating plate is fixedly connected to the surface of a left steel plate through a third bolt, fixing plates are arranged on the two sides of the bottom end of the upper steel plate on the left side, and a plurality of first bolts are evenly arranged at the top ends of the fixing plates. According to the folding safety protection shed frame, the protection shed frame can be welded and spliced through existing steel plates, steel pipes and other mater