The invention relates to a drum shearer power supply cable protection device. The drum shearer power supply cable protection device comprises a microswitch, an upper cover, a lower cover, safety pins, bolts and a control ring. The upper cover and the lower cover are connected through the bolts. The control ring is installed in the upper cover and the lower cover. The microswitch is installed on the upper part of the upper cover, the lower part of the microswitch is fixedly connected with a spring, a steel ball is installed on the lower part of the spring, and the steel ball is attached to the surface of the control ring under the effect of the spring. The number of the safety pins is two, one safety pin is installed in the upper cover and the control ring, and the other safety pin is installed in the lower cover and the control ring. The drum shearer power supply cable protection device has the advantages that the structure design is reasonable, the cost is relatively low, etc. When a full force exceeding a maximum allowable pull force is applied to a cable, the safety pins break, the shearer stops working, the pull force is no longer applied to the cable, the protection on the cable is in time and effective, and a cable protection sheath is prevented from being torn due to a too small bending radium of a cable elbow.