The invention discloses a sand washer used for water conservancy equipment production. The sand washer comprises a cleaning box, wherein a sand washing plate is arranged inside the cleaning box; the two side surfaces of the cleaning box are equipped with fixed rods; tops of the fixed rods are fixedly connected with a supporting frame; the top of the supporting frame is fixedly connected with a motor; the output end of the motor is fixedly connected with a rotary rod; one end, away from the motor, of the rotary rod is fixedly connected with a first gear; a rack is arranged on the outer surfaceof the first gear; the inner wall of the rack is engaged with the outer surface of the first gear; one end, away from the first gear, of the rack penetrates through the top of the supporting frame andextends to the outer part of the supporting frame; the top of the cleaning box is fixedly connected with a first fixed plate and a second fixed plate; the top of the first fixed plate and the top ofthe second fixed plate are fixedly connected with the bottom of the supporting frame; and a second gear is arranged on one side surface of the first fixed plate. The sand washer used for water conservancy equipment production has the advantages of being simple in structure and high in working efficiency, and not wasting water resources.