Deep well anode/cathode protection device for protecting embedded steel pipeline

The utility model discloses a deep well anode/cathode protection device for protecting an embedded steel pipeline. The device comprises an anode well, a constant potential rectifier, an anode component, a reference electrode, a grounding electrode, a cathode cable and a zero cathode-connecting cable, wherein the constant potential rectifier is connected with the anode component, the grounding electrode and the reference electrode through an anode cable, a grounding electrode cable and a reference electrode cable respectively; the cathode cable and the zero cathode-connecting cable, which are connected with the embedded steel pipeline, are also arranged on the constant potential rectifier; the anode component includes a plurality of auxiliary anodes embedded in the anode well, anode racks for the mounting of the auxiliary anodes, a gas guide pipe arranged on the anode racks, a plurality of anode cables in the well which are connected onto the auxiliary anodes, and a busbar for converging the anode cables in the well; and the anode cables are connected onto the busbar. During the constant power supply of the constant potential rectifier, a current circuit can be formed between a deep well anode and the pipeline to protect the pipeline.