The utility model discloses an efficient impurity removing device for flour. Box body, a rectangular frame is transversely arranged in the box body; a first filter plate is fixedly connected to the inner edge of the opening in the lower end of the rectangular frame; fixed blocks are fixedly connected to the inner walls of the left and right sides of the box body; the upper end of one fixing blockis fixedly connected with a spring; a groove is formed in the upper end of the other fixing block; the interior of the groove is rotatably connected with the right side of the lower end of the rectangular frame through a rotating shaft, the upper end of the first filter plate is fixedly connected with two obliquely-arranged check blocks, the opposite ends of the two check blocks are fixedly connected with the side wall of the rectangular frame, the inner wall of the right side of the box body is fixedly connected with a mounting block, and a cavity of a conical structure is formed in the mounting block. According to the wheat grain screening device, wheat grains which are not fully ground in flour can be rapidly screened out, the wheat grains retained on the filter plate can be discharged,meanwhile, the discharged wheat grains can be ground for the second time, the production efficiency is improved, and time and labor are saved.