Provided is a method of causing potato seeds of potatoes to increase in yield through electron beam irradiation and a device thereof. The invention relates to a method through electron beam irradiation and a device thereof, which overcomes drawbacks of slow act on increasement in yield of the potatoes in the prior irradiation mutation breeding method. According to the inventive method, the electron beam is used to irradiate the potato seeds of the potatoes, wherein the electron beam is the charged particles generated by an accelerator, dose of the electron beam is 1-24 grail; the range of dose rate is 0.1-2.7 grail/second. The inventive device comprises an accelerator scanning case, a baffle, a beam flux gauge, a beam flux integrator and a metal plate, wherein the accelerator scanning case is arranged above, the baffle is arranged on a lower part of the accelerator scanning case, the metal plate is arranged on the lower part of the baffle, one end of the beam flux gauge is connected on the baffle, one end of the beam flux integrator is connected on the metal plate, and the other end of the beam flux gauge and the beam flux integrator is grounded.