Belonging to the technical field of cathodic protection, the invention relates to a cathodic protection monitoring device and method. A pipeline is disposed as a cathodic protection station, the cathodic protection station is provided with a potentiostat serving as a cathodic protection power supply, the cathode of the potentiostat is connected to the pipeline through a cathode cable, and the anode of the potentiostat is connected to an auxiliary anode through an anode cable. The monitoring device consists of a synchronous interrupter, a reference electrode, a test pile and a multimeter. The synchronous interrupter is connected to the anode of the potentiostat and the anode cable, and is in series connection between the potentiostat anode and the auxiliary anode. The test pile is in connection with the pipeline buried underground, and is internally equipped with a test cable connected to the pipeline. And the multimeter is respectively connected to the test cable in the test pile and the reference electrode. The cathodic protection monitoring device provided by the invention has the characteristics of simple structure, convenient operation, strong practicability and adaptability, and suitability for various environments, is especially suitable for dry soil region, and is accord with the requirements of the country and petroleum industry for cathodic protection technology and other relevant technical specifications.