The invention provides a device for crushing ore through continuous discharge and a method for crushing ore by using the same. A high-voltage discharge electrode partially stretches into a deionized water container, an insulating bush is arranged between the high-voltage discharge electrode and the deionized water container, the deionized water container contains deionized water, a low-voltage discharge electrode is fixedly arranged in the middle of the deionized water container, the low-voltage discharge electrode is provided with a holding chamber, the bottom surface of the holding chamber is provided with screen holes, the stretching portion of the high-voltage discharge electrode is aligned to the holding chamber on the low-voltage discharge electrode, and the upper end of the high-voltage discharge electrode is connected with the rotating shaft of a motor. The device for crushing ore through continuous discharge and the method for crushing ore by using the same have the beneficial effects that the crushing of ore through continuous discharge can be realized, the problem that discharge dead zones exist during electrode discharge is overcome, the electric crushing efficiency of ore is improved and the subsequent treatment difficulty of ore is reduced.