Cathode protection test reference tube

The utility model relates to a cathode protection test reference tube, which comprises a support module and a detection module, the detection module is located in the support module and is connected with a test object through a cable, a cable tube for supporting the cable is sleeved outside the cable, the test object comprises a buried pipeline and a test pile, and the test pile is connected with the buried pipeline. The supporting module comprises a conical tube, a fixed disc and a supporting disc, the fixed disc and the supporting disc are both fixed on the inner surface of the conical tube, the detection module comprises a long-acting reference electrode, a weightlessness detection sheet and a cathode protection potential detection sheet, the long-acting reference electrode penetrates through the fixed disc and is supported and fixed by the supporting disc, and the weightlessness detection sheet is fixed on the inner surface of the conical tube. The cable tube is connected to the test pile through a cable,