Protective device

The utility model relates to the technical field of building construction, in particular to a protection device which comprises a fixing frame, an anti-falling plate is movably installed on the inner side wall of the fixing frame, positioning blocks are installed on the two inner side walls of the fixing frame in a sliding mode, two first spring blocks are fixedly installed at the side end of each positioning block, and the two first spring blocks are connected with the anti-falling plate in a sliding mode. Two directional sliding blocks are installed on the inner side wall of the fixing frame in a sliding mode. Through the acting force of the reset spring, the directional sliding block slides to the inner side of the anti-falling plate and is not extruded by the second groove, the fixing block slides outwards under the pushing of the second spring block, the fixing block slides out of the side end of the anti-falling plate, the fixing block stays at the two ends of the second groove, and the anti-falling pla