Safety protection device for building civil engineering

The safety protection device for the building civil engineering comprises a fixing base, a stand column and a protection plate, a plurality of first ventilation holes are evenly formed in the protection plate, auxiliary plates are slidably connected to the two sides of a containing groove in the protection plate, and a plurality of second ventilation holes are evenly formed in the auxiliary plates; one end of the auxiliary plate penetrates and extends into the driving groove of the stand column and is fixedly connected with a trapezoidal block, a plurality of first springs are fixedly arranged between movable plates hinged to the two sides of the protection plate and the stand column, movable rods on the inner sides of the movable plates penetrate and extend into the driving groove and are slidably connected with the side wall of the trapezoidal block, and a buffering mechanism is arranged between the stand column and the fixing base. A limiting assembly used for fixing the buffering mechanism is arranged at