Safety protective fence for building stairs

The utility model discloses a safety protective fence for building stairs, which belongs to the technical field of safety protective fences for building stairs and comprises a base, a first motor is fixedly mounted at the top of the base, a first lead screw is fixedly connected onto an output shaft of the first motor, and a threaded rod is in threaded connection with the surface of the first lead screw. A second motor is fixedly installed on the side face of the threaded rod, a second lead screw is fixedly connected to an output shaft of the second motor, a threaded cylinder is in threaded connection with the surface of the second lead screw, three fixing blocks are fixedly connected to the side face of the threaded rod, and bolts are in threaded connection with the interiors of the three fixing blocks. The first motor works to drive the first lead screw to rotate, then the threaded rod is driven to move, the purpose of lifting or lowering the protective fence is achieved, the second motor works to drive the