Wellhead safety protection device of slag slipping well

The utility model relates to the field of building construction safety, and particularly discloses a slag slipping well mouth safety protection device which comprises a protection base arranged on the periphery of a well mouth and a vertical protection fence installed on the protection base. The radius of the protection ring is larger than that of a well mouth, two parallel horizontal fixing rods are arranged in the protection ring, vertical abutting rods are arranged on the lower surfaces of the horizontal fixing rods, and the abutting rods abut against the well wall to fix the protection ring. The insertion plates extend outwards in the radial direction of the protection ring, and the upper surfaces of the insertion plates are sunken inwards to form first insertion grooves; the protective fence comprises a plurality of transverse rods, the outer ring of each rotating bearing is connected with one transverse rod, the inner ring of each rotating bearing is connected with the other adjacent transverse rod, and