Abstract: In the past decades, China had rapid economic development accompanied by a large number of garbage production, eventually most of them converge in various rivers. In order to protect the normal operation of the pumping station, it is required that the trash rack of the pumping station can be cleaned in time. Due to the structural defects, the conventional rotary sewage interceptor and cleaning machine has low waste clean efficiency, high leakage rate of the waste and high failure rate of equipment, which affects the normal operation of the sewage interception and cleaning equipment and pumping station units. In order to improve the reliability and efficiency of the cleaning equipment, the structure of the conventional rotary sewage interceptor and cleaning machine is improved and optimized. The walking mode of the roller convex rail and the limit device are advanced on the rack traction chain to avoid the derailment of the chain and improve the positioning accuracy of the rack. On this basis, the rack bar section is changed from rectangle to diamond arrow type, and the rack teeth are changed from triangle to plate type. The plate tooth surface is supported by a triangular stiffened plate, and the tooth harrow pipe is changed from a circular pipe to a rectangular one, which enhances the load-carrying capacity of the single harrow tooth and the bending strength of the tooth harrow. It has been realized that the harrow teeth, the tooth harrow and the rack are precisely matched with each other, the adhesive blockage of the rack is reduced, the overload of harrow tooth and harrow pipe is avoided by cutting off the dragging weeds in front of the rack in the initial cleaning stage, and the broken accidents of harrow tooth and harrow tube are avoided, also. 2-3 pieces of split structure trash rack are used in the wide single-hole trash rack to facilitate the lifting, maintenance and replacement of the grid. Side dirt guide plates and bottom arc front rack are used to clean the trash accumulating at the pier beam and bottom of the rack and improve the trash-cleaning efficiency at the sides and bottom. The application results show that through structure improvement, the operation reliability and the trash-cleaning efficiency of the rotary sewage interceptor and cleaning machine has been improved, the equipment failure rate and maintenance cost has been reduced, the water level difference before and after the trash rack has been reduced also, and therefore, the operation reliability and the efficiency of the pump station have been improved. Compared with the conventional rotary sewage interceptor and cleaning machine, the improved rotary sewage interceptor and cleaning machine has higher reliability, increases the cleaning efficiency by more than 30%, reduces the average water level difference before and after the trash interception grid from 60 cm to less than 10 cm, and reduces the operation cost of the pumping station by about 184 thousand yuan.