Manhole door without dead angle

The utility model relates to a dead-corner-free manhole door which is characterized in that a reinforcing plate is annular, the reinforcing plate and the inner wall of a barrel are welded into a whole, a pair of limiting stoppers are symmetrically arranged on the outer wall of the reinforcing plate, a manhole door plate is arranged in the barrel, a sealing ring is arranged on the outer edge of the manhole door plate in a sleeved mode, and the limiting stoppers are arranged on the outer wall of the manhole door plate. The contact face of the sealing ring and the reinforcing plate is provided with a plurality of annular protrusions for sealing, the manhole door plate is fixedly connected with the top end of a center shaft, the center shaft is sequentially sleeved with a pressing beam and a handle, the handle is meshed with the center shaft through threads, and the sealing ring is fixedly connected with the center shaft. The manhole door plate and the pressing beam are mutually pressed and sealed through rotatio