The invention discloses a method for realizing the acceleration of high-flow-intensity electrons based on a tokamak device. The method includes the following steps that: the tokamak device is switchedon, so that stable plasma current can be formed; a tokamak central control system injects a gas into plasmas at a preset time point, stable plasma current having been formed in the plasmas, so that ahigh-flow-intensity electron beam can be formed; whether the high-flow-intensity electron beam deviates an equilibrium position is monitored at intervals of preset monitoring time after the high-flow-intensity electron beam is formed; and when the high-flow-intensity electron beam deviates the equilibrium position, the tokamak central control system energizes a poloidal field coil, so that a magnetic field can be generated to pull the high-flow-intensity electron beam to the equilibrium position. With the method of the invention adopted, the flow intensity of the electron beam can be as highas an order of megaamperes, which is higher than the flow intensity of the electrons of an existing electron linear accelerator by 108 orders. The method is based on the tokamak device; and the electron beam with very high flow intensity can be realized by means of the injection of a large amount of gas; a multi-stage acceleration structure is not required; and a control method is simple.