Self-lifting overflow device of pipe network construction service well

The utility model relates to a pipe network construction service well self-lifting overflow device which comprises a service well, a self-lifting overflow assembly is arranged in a cavity of the service well, the self-lifting overflow assembly comprises a semicircular top plate fixed on the inner wall of the service well, and the semicircular top plate is located between a rainwater separation pipeline and a sewage collection pipeline. A lifting plate is movably arranged on the side, close to the rainwater separation pipeline and the sewage collection pipeline, of the semicircular top plate in a penetrating mode, a long-circle-shaped adaptive hole is formed in the lifting plate, a floating plate is fixed to the position, in the middle of the long-circle-shaped adaptive hole, of the inner side wall of the lifting plate and located below the semicircular top plate, and a semicircular inner hole is formed in the semicircular top plate. Anti-falling baffles are arranged on the two sides of the lifting plate penet