Abstract: In view of the problems existing in the ways of pipeline cathodic protection inspection, a way to collect cathodic protection current and stray current data that exist inside the pipeline was put forward. After theoretical calculation and analysis, the research scheme is determined, the electronic circuit module and the detection structure of the developed design are tested. It is proven that it is feasible to realize pipeline current detection through internal detection technology, and can be further developed and popularized in engineering application.