The invention provides a multi-test-block polarization probe with pipeline cathodic protection. The multi-test-block polarization probe is characterized in that an inner cavity (2) with an inner cover (3) is sleeved into the center of the lower middle part through an outer cavity (4) with an outer cover (5); an ion-conductive polymer (1) is fixed into the center of the bottom of the inner cavity (2), and the inner cavity (2) is in fit sealing with the inner cover (3) through threads and a gasket; the outer cavity (4) is in mechanical sealing with the outer cover (5); a copper bar (6) is inserted into the inner cavity (2) from the inner cover (3) and sealed on the inner cover (3); a cable (8) is introduced into the outer cavity (4) from the middle part of the outer cover (5); a test block I (9) and a test block II (11) which are respectively connected with a lead II (10) and a lead III (12) in the cable are mounted on the outer surface of the outer cavity (4) through the threads and the gaskets; saturated copper-bath (13) is filled in the inner cavity (2). By adopting the multi-test-block polarization probe with the pipeline cathodic protection, the permeation and dropping of a reference electrode solution can be avoided, a semipermeable membrane can be prevented from blocking, and an electrode can be prevented from corroding; the service life of the multi-test-block polarization probe is long; the area of the polarization test blocks can be adjusted.