The utility model discloses an it is multi -functional to core appearance relates to power communication line cable core detection technical field, the device includes: transmitter, receiver and clip for cable conductor, the transmitter is connected with the one end of the cable that awaits measuring, the receiver is connected with the other end of the cable that awaits measuring, clip for cable conductor one end is clamping structure, and with the cable junction that awaits measuring, the other end is quartzy first structure for the cable that will await measuring inserts the RJ45 net gape. The utility model discloses a with a plurality of light mouths, the electricity mouth integrates in one set of instrument, the tradition has been changed to the single defect of core device interface type, can be simultaneously to the multifiber, the net twine, the cable is to core and light power testing, and automatic display is to the core result, the root is consuming time to the core mode one by one to have eliminated traditional manual work, it is hard, the rate of accuracy is low, the drawback of inefficiency, easy operation, convenient to carry, the practicality is strong, work efficiency and rate of accuracy are high, it is normal to electric power system, positive effect has been played in high -efficient operation.