Sewage suction machine for sewage treatment tank

The utility model discloses a sewage suction machine for a sewage treatment tank, which comprises a sewage collection device arranged in a tank body, the sewage collection device comprises a sludge storage bin and a plurality of sewage suction hoses uniformly distributed along the circumference of the sludge storage bin, and the sewage suction hoses are placed in sludge; the top of the sludge storage bin is fixed on a support frame, and the support frame is arranged above the tank body; the left side and the right side of the supporting frame are respectively provided with a sludge collecting ship, the sewage sucking and discharging device comprises a sewage sucking pump arranged on the supporting frame, an inlet of the sewage sucking pump is connected with a sewage inlet pipe, and an outlet of the sewage sucking pump is connected with a sewage discharging pipe; the lower end of the sewage inlet pipe extends into the sludge storage bin of the sewage collection device, the discharge end of the sewage discharge