The invention belongs to the technical field of rain sewage inspection wells, in particular to a municipal rain sewage inspection well and a using method thereof. The municipal rainwater sewage inspection well comprises a wellhore, wherein a fixing groove is formed in the top of the wellhore, a fixing block is arranged in the fixing groove, a well lid is fixedly connected to the top of the fixingblock, and a sliding groove is formed in the well lid. According to the municipal rain sewage inspection well and the using method thereof, the fixing block and the fixing groove are arranged, so thatthe well lid and the wellhore can be fixed together, the well lid is prevented from being displaced from the wellhore, the occurrence of potential safety hazards is reduced, under the combined actionof the sliding groove, the sliding block, a water inlet and a baffle, the baffle cannot shield the water inlet by sliding the sliding block under the condition of encountering heavy rain or rainstorm, the flow of rain sewage entering the wellhore is increased, ponding water is reduced, when in sunny days, the baffle can shield a part of the water inlet, garbage is prevented from entering the wellhore from the water inlet, when the baffle is covered, the water inlet cannot be completely shielded, and the entering of daily sewage is not affected.