Construction protective fence for constructional engineering

The construction protective fence comprises a base, a main sleeve rod is movably installed in the left side of the base, the upper end of the main sleeve rod is fixedly connected with a rotating disc through a vertical rod, the interior of the main sleeve rod is in threaded connection with a main screw rod, and the surface of the upper end of the main sleeve rod is in transmission connection with an auxiliary sleeve rod through a rotating mechanism; the number of the auxiliary sleeve rods is three, the interiors of the three auxiliary sleeve rods are all in threaded connection with auxiliary screws, the main sleeve rod is driven to rotate by rotating the rotating disc, the main sleeve rod drives the auxiliary sleeve rods to rotate through a rotating mechanism, and the main sleeve rod and the auxiliary sleeve rods rotate so that the main screws and the auxiliary screws in the main sleeve rod and the auxiliary sleeve rods can vertically ascend and descend at the same time. According to the arrangement of the st