Nested horizontal cleaning device

A nested horizontal cleaning device is fixedly mounted on a vertical lifter in a condenser water chamber and parallel to a condenser tube plate and comprises a lifting beam, a nested through-flow assembly, two front-back pushing mechanisms and a plurality of horizontal guide assemblies, and the lifting beam is horizontally arranged in the left-right direction and fixedly connected to a lifting assembly of the vertical lifter. The nested through-flow assembly is horizontally arranged on the rear side of the lifting beam in the left-right direction and is parallel to a condenser tube plate, the two front-back pushing mechanisms are fixedly installed on the lifting beam in a left-right symmetry mode, the telescopic ends of the two front-back pushing mechanisms extend backwards and are fixedly connected with the nested through-flow assembly, and the horizontal guiding assemblies are arranged in a left-right spaced mode. The horizontal guide assemblies are horizontally arranged in the front-back direction, and the