The invention discloses a direct-current high current generation device capable of bearing direct-current high voltage, and a method. The direct-current high current generation device comprises a motor, a rectifier and an insulating platform, and the motor is connected with a power generator through an insulating transmission belt and used for driving the power generator by generated mechanical energy through the insulating transmission belt, so that the power generator generates a three-phase alternating current; the rectifier is connected with the power generator and a to-be-tested product,the rectifier and the power generator are jointly placed in a metal Faraday cage, and the rectifier is used for rectifying the three-phase alternating current so as to obtain a direct-current high current and output the direct-current high current to the to-be-tested product; and the insulating platform is used for bearing the rectifier, the power generator and the metal Faraday cage, so that thepower generator, the rectifier and the to-be-tested product are located at the high-voltage equal potential. According to the direct-current high current generation device, high-voltage insulation isolation between the motor and the power generator is realized through the insulating belt, the power generator and the rectifier are placed behind the metal Faraday cage and then placed on the insulating platform, thus the direct-current high current generation device is located at the high-voltage equal potential, insulates against the ground and thus can bear the direct-current high voltage, andsupport is provided for a direct-current high current experimental system experiment.