Harmful gas safe release system of sewage inspection well

The utility model discloses a safe harmful gas release system for a sewage inspection well, belongs to the field of municipal sewage discharge, and solves the problems that the existing ventilation mode is large in workload and affects traffic. The device comprises a ventilation pipeline, an exhaust fan, a hydrogen sulfide concentration sensor and a methane concentration sensor, one end of the ventilation pipeline is communicated with a sewage inspection well, the other end of the ventilation pipeline extends out of the ground and is communicated with the atmosphere, the exhaust fan is arranged on the ventilation pipeline, and the hydrogen sulfide concentration sensor and the methane concentration sensor are both located in the sewage inspection well. And the hydrogen sulfide concentration sensor and the methane concentration sensor are respectively connected with the exhaust fan through the remote measurement and control terminal. The hydrogen sulfide concentration and methane concentration in the sewage ins