Efficient sewage pretreatment device

The invention discloses an efficient sewage pretreatment device. The invention relates to the technical field of sewage treatment equipment. The device comprises a treatment box and a water inlet; a crushing box is arranged at the upper part in the treatment box; crushing rollers are symmetrically arranged on the left and right sides in the crushing box; a screening box is arranged below the crushing box; a double-shaft motor is fixedly mounted on the surface of the left side wall of the treatment box; two sides of the double-shaft motor are symmetrically connected with rotating shafts; the rotating shaft is connected with an incomplete bevel gear; a rotating rod is arranged above the interior of the screening box; a screen is arranged at the bottom of the screening box; a screw rod is arranged below the rotating rod; a nut is arranged on the surface of the screw rod; the bottom of the nut is fixedly connected with a scraping plate; the nut can drive the scraping plate to reciprocate on the surface of the scr