The invention discloses a house water supply drainage ditch trench wall cleaning machine. The machine structurally comprises a front fixing plate, a motor, a front stretchable box, a belt opening, a belt, a cleaning device, a rear stretchable box, a rear fixing supporting plate and a motor lug base. The front fixing supporting plate is rectangular, the right side of the front fixing supporting plate is welded to the left end face of the front stretchable box and fixedly connected to the ground, the motor is fixed to the front fixing supporting plate through the motor lug base, the front stretchable box is cubic, the belt is arranged inside the front stretchable box, the belt opening is embedded into the inner side face of the front stretchable box, the belt is arranged in the middle, and the belt is in a strip shape. The house water supply drainage ditch trench wall cleaning machine has the advantages that the cleaning speed of a cleaning device is controlled through the operation speed of the motor, the cleaning mode of simultaneous scraping and brushing is adopted, the cleaning effect is high, the belt operation mode is adopted, the cleaning time is shortened, the efficiency is improved, the machine is applicable to trenches of different shapes, a large amount of labor force, time and costa re saved, and the practicability is high.