Underwater dredging equipment for drainage pipe network

The invention discloses drainage pipe network underwater desilting equipment, and particularly relates to the field of drainage pipe desilting, the drainage pipe network underwater desilting equipment comprises a drainage pipe, a positioning ring is fixedly mounted in the drainage pipe, a positioning support frame is fixedly mounted on the inner side of the positioning ring, and a first I-shaped roller is rotatably connected to the outer side of the positioning support frame; a first volute spiral spring is arranged in the first I-shaped roller, one end of the first volute spiral spring is connected with a first connecting rope in a clamped mode, the first connecting rope is connected to the outer side of the first I-shaped roller in a wound mode, and one end of the first connecting rope is connected with an automatic storage barrel in a sleeved mode. According to the device, an automatic storage barrel is arranged, sludge is collected through the automatic storage barrel, so that the weight is increased and