The invention discloses a screening device for production of ferric phosphate, which comprises a bottom plate; the left side of the top of the bottom plate is fixedly connected to a support plate, the top of the front surface of the support plate is movably connected to a connecting plate, the top of the connecting plate is fixedly connected to a box body, the top of the right side of the inner wall of the box body is fixedly connected to a filter net, the left side of the filter net is fixedly connected to the left side of the inner wall of the box body, the top of the left side of the box body is provided with a discharging opening, the bottom of the left side of the box body is provided with a through hole, and the right side of the bottom of the box body is fixedly connected to a support. By cooperative use of the bottom plate, the support plate, the connecting plate, the box body, the filter net, the support, an idler wheel, a spring, a chute, a sliding rod, a trapezoid block, a wheel groove, a tooth plate, a motor, and a gear, the effect of efficiently screening the ferric phosphate is achieved, and the problems that requirements of battery production cannot be met and the production efficiency of the battery is reduced since most existing screening manners for the ferric phosphate are manual screening by workers are solved.