Safety protection device for additionally installing elevator shaft scaffold on old building

The utility model relates to a safety protection device for an elevator shaft scaffold additionally arranged on an old building, which comprises a transverse frame, a vertical frame and a protection piece, and the transverse frame is obliquely connected with the vertical frame; the protection part comprises a shielding part, an abutting part and an installation part, the shielding part is provided with a first face and a second face which are adjacent to each other, the installation part is connected with the first face, the abutting part is connected with the second face, a groove is formed in the installation part, the installation part is arranged on the transverse frame in a sleeving mode through the groove, and the transverse frame is connected with the abutting part through the groove. And the propping part is propped against the vertical frame. The installation part, the shielding part and the vertical frame can form a triangular structure, so that the protection piece is stably fixed to the transverse