The utility model discloses pipeline cathodic protection and outer corrosion rate monitoring probe relates to a cathodic protection potential measurement and outer corrosion rate measuring probe. But its purpose is in order to provide a simultaneous measurement cathodic protection performance parameter effective solution with outer corrosion rate parameter and on -line monitoring. The utility model discloses a probe main part, probe are provided with the cavity that has a perfect understanding in the main part, cathodic protection and outer corrosion rate monitoring devices including the reference electrode that lies in the reference electrode cavity, lie in the current potential test test block of current potential test test block cavity and lie in the corrosion rate test block of corrosion rate test block cavity, monitoring devices passes through a connecting wire and the 2nd connecting wire is continuous with the corrosion rate 0 outside the main part of popping one's head in. The utility model discloses the measurable buret of pipeline cathodic protection and outer corrosion rate monitoring probe says and realizes corrosion rate outside corrosion potential, circular telegram current potential, polarization potential, alternating voltage, friendship direct current density and pipeline monitoring the pipeline omnidirectional.