The invention provides an electronic accelerator scanning box, comprising a scanning box body which is composed of a hollow rectangular cylinder upper seat and a hollow trapezidal cylinder lower seat; two trapezoidal side plates of the hollow trapezidal cylinder lower seat are internally provided with stainless steel trapezoidal plates; leads are connected on the stainless steel trapezoidal plates, and are in connection with an electric signal measuring device. The electronic accelerator scanning box has a simple, compact and reasonable structure, and can rapidly discover bump faults on the side plates of the electronic accelerator scanning box caused by electron beam deflection, and effectively prevent electron beams from breaking down the scanning box so as to avoid serious faults of an electronic accelerator.