Municipal road water supply and drainage pipeline connecting piece

The utility model relates to the field of road drainage equipment, in particular to a municipal road water supply and drainage pipeline connecting piece which comprises an upper mounting ring, a lower mounting ring and a fixing piece used for fixing the upper mounting ring and the lower mounting ring, and a cavity used for being connected with a water supply and drainage pipeline in an inserted mode is formed between the upper mounting ring and the lower mounting ring. A hollow sealing ring used for being arranged on the water supply and drainage pipeline in a sleeving mode is installed on the upper installation ring, an inflation assembly used for enabling the hollow sealing ring to expand is arranged on the upper installation ring, and the inner side face of the expanded hollow sealing ring abuts against the two adjacent water supply and drainage pipelines. The municipal water supply and drainage pipeline connecting piece has the effect that municipal water supply and drainage pipelines with different diame