Municipal drainage system

The utility model relates to a municipal drainage system, and relates to the field of municipal drainage technologies. The municipal drainage system comprises a drainage pipeline, a drainage grate buckled to the drainage pipeline, a main pipeline communicating with the lower portion of the drainage pipeline, a supporting plate abutting against the lower portion of the drainage grate and a supporting mechanism arranged below the supporting plate and used for reinforcing and supporting the drainage grate. A mounting groove is formed in the drainage pipeline, the drainage grate abuts against the interior of the mounting groove, and the drainage grate is detachably connected with the supporting plate; the supporting mechanism comprises a connecting plate fixedly arranged below the supporting plate and a plurality of supporting sets arranged below the connecting plate. Each supporting set comprises two supporting rods which are fixedly connected, and the two supporting rods are arranged in a crossed mode. The drai