Protective device for mine wellhead of mine hoist

The utility model discloses a protection device for a mine well mouth of a mine hoist. A through hole is formed in the middle of a bottom plate corresponding to the well mouth, a heightening table is welded to the top of the edge of the through hole, a well mouth protection sleeve is arranged in the through hole, and an outer extension edge is arranged at the top of the well mouth protection sleeve and is in lap joint with the heightening table; each supporting rod comprises a supporting sleeve and a supporting loop bar, the supporting loop bar is slidably arranged in the supporting sleeve, a fixing structure and a bottom plate are arranged at the top of each supporting sleeve, first fixing sleeves are arranged at the four corners of the top of the bottom plate and correspond to the supporting sleeves, and second fixing sleeves are arranged at the four corners of the ceiling and correspond to the supporting loop bars; the upper end and the lower end of the supporting rod are inserted into the second fixing sl