▎ 摘　　要

NOVELTY - The utility model claims a double-layer tank cathode protection device, comprising an auxiliary anode, a solar generator and a storage battery, the auxiliary anode comprises a graphene shell layer and sealed hollow cavity, an auxiliary anode buried under the ground; solar generator comprises a graphene solar plate and base pedestal, a solar generator is buried in the ground and graphene solar plate surface is parallel to the ground; the storage battery is installed in the sealed hollow cavity, joint data transmission charging of the storage battery through a first cable connected to the solar generator. the anode joint of the storage battery through a second cable connecting graphene shell layer, cathode of the storage battery connector connected to double-layer oil tank through the third cable. A double-layer oil tank using a cathodic protection device of this utility model, graphene shell layer of the auxiliary anode can effectively protect storage battery, graphene solar plate can effectively protect the solar generator, a cathode protection device embedded in the ground, saves ground space, and not easy to be destroyed by people.