Sewage plant glass fiber reinforced plastic cover plate with observation window

The utility model relates to a sewage plant glass fiber reinforced plastic cover plate with an observation window, which comprises a glass fiber reinforced plastic cover plate with a double-layer structure and reinforcing ribs, an observation cover plate is hinged on the glass fiber reinforced plastic cover plate, a square through hole is arranged on the glass fiber reinforced plastic cover plate below the square observation cover plate, and the observation window and an exhaust valve are arranged on the observation cover plate which can be opened outwards. The observation cover plate is hinged to the glass fiber reinforced plastic cover plate, the observation window and the exhaust valve are arranged, the sewage condition can be observed without opening the cover plate, rapid sampling can be carried out after the observation cover plate capable of being opened outwards is opened, operation is convenient and fast, harmful gas can be exhausted through the exhaust valve on the observation cover plate, and safet