Sealing device for squat silo top escalator type manhole

A sealing device for a squat silo top escalator type manhole comprises a cover plate capable of sealing the manhole through a plurality of pressing mechanisms, a rubber mat arranged on the lower surface of the cover plate is arranged between the cover plate and an upper end opening of the manhole, one side of the cover plate is rotationally connected with a silo top manhole frame through at least two rotating mechanisms, so that the cover plate can be laterally opened, and the cover plate is provided with an opening. The rotating mechanism comprises a screw rod, the bottom end of the screw rod is rotationally connected with a bin top manhole frame, the top end of the screw rod penetrates through the cover plate and is rotationally connected with a pressing piece capable of pressing the cover plate to an upper port of the manhole, and the portion, located between the cover plate and the bin top bin top manhole frame, of the screw rod is sleeved with a spring. And the spring can jack up the cover plate to form