Cathode protection anti-corrosion device for underground pipeline

The utility model relates to the technical field of cathodic protection and corrosion prevention, and discloses an underground pipeline cathodic protection and corrosion prevention device which comprises positioning rings, connecting assemblies are arranged on the inner walls of the positioning rings, fixing blocks are fixedly connected to the close sides of the two positioning rings, and the connecting assemblies are arranged on the inner walls of the two positioning rings. And a fixing assembly is arranged in the fixing block. The position of the metal block can be fixed, when the metal block needs to be replaced for a long time, a worker does not need to find the metal block, only needs to open a closing plate and pull open a first spring to be matched with a first pull plug to fix the metal block, so that replacement is completed, working efficiency is improved, and in the step-by-step locking process of a locking ring, the metal block can be conveniently replaced. The underground pipeline body is gradual