Anti-theft municipal manhole cover dismounting device

The utility model discloses an anti-theft municipal manhole cover dismounting device which comprises a base and a manhole cover, the upper end and the lower end of the manhole cover are open, the manhole cover is movably connected to the upper end in the base in a clamped mode, a circular groove coinciding with the central axis of the manhole cover is formed in the manhole cover, and four rectangular holes communicated with the interior of the circular groove are formed in the side face of the manhole cover. A clamping plate is movably inserted into the rectangular hole in a penetrating mode,a sliding groove corresponding to the clamping plate is formed in the upper surface of the well lid, a push plate fixedly connected with the clamping plate is arranged in the sliding groove in a sliding mode, and a positioning groove corresponding to the clamping plate is formed in the upper end of the inner side face of the base; a circular plate is rotationally arranged in the circular groove, and four first limiting gr