The invention relates to an electrical system and a test method for a PLC control-based marine oil pipe dynamic tester. The system comprises a PLC control system, and a dynamic test device and a touch screen which are connected with the PLC control system; and the PLC control system communicates with the touch screen through PROFIBUS. The test method comprises bending test, torsion test and tensile test. The system and the method have the advantages of basic realization of automatic test, realization of saving of the land, a lot of manpower and a lot of time through integrating three test functions of bending, torsion and tension, increase of the accuracy, guaranteeing of the safety of workers, and great increase of the production efficiency.