Secondary cable core check device

The invention provides a secondary cable core check device which comprises a transmitting end circuit board and a receiving end circuit board. The transmitting end circuit board and the receiving endcircuit board are provided with a common interface and a plurality of electrical signal interfaces correspondingly; the electrical signal interfaces are used for connecting a cable core; the common interface is used for connecting a cable shield layer or a known common cable core; the transmitting end circuit board is further provided with a switch module, an indicator light and a power supply module, one end of the power supply module is connected to the common interface of the transmitting end circuit board; the other end of the power supply module is connected with the electrical signal interface of the transmitting end circuit board by the indicator light, the switch module in sequence; the receiving end circuit board is provided with an inductive node, a loop indication light, a second control module and a di