Hydraulic drive sewage suction type self-cleaning pump front filtering device

A hydraulic drive sewage suction type self-cleaning pump front filtering device comprises a floating barrel, a filtering barrel, a water outlet pipe, a sewage discharge pipe, a sewage suction pipe, a sewage suction nozzle, a hydraulic drive mechanism and a rack, the floating barrel is fixed to the top end of the rack through a floating barrel cross beam, the filtering barrel is vertically arranged in the center of the rack, and the water outlet pipe is vertically arranged in the center axis position of the filtering barrel; the water outlet pipe is fixed to the top of the rack through a water outlet pipe hoop, a water inlet hole is formed in the side wall of the bottom of the water outlet pipe, the hydraulic driving mechanism is arranged in the water outlet pipe and is in butt joint with a sewage driving shaft movably arranged in the sewage discharging pipe, the sewage sucking pipe is L-shaped, and the horizontal section of the sewage sucking pipe is communicated with the side end of the sewage discharging pi