The situation is quite rough when using the differential lock when the car is out of difficulty due to high torque or improper operation, the differential lock fails. This has an adverse impact on car brands and driver safety. With the increasing number of off-road vehicles in China, differential lock as one of the important components of off-road vehicles, it is essential to ensure the reliability of the differential lock. At present, the research on differential locks in China is relatively backward and there is no standardized test standard established. In recent years, there has been an increasing demand for research on the performance and reliability of differential locks among enterprises, however, the research on relevant standards and test benches in China is still incomplete. After analyzing relevant experimental standards and theoretical knowledge both domestically and internationally. Based on the actual needs of manufacturing enterprises and the actual usage of the vehicle. This paper provides a test rig method based on the electronic control differential lock of an off-road vehicle. According to the experimental plan, a differential lock durability impact test bench and a static torsion test bench were built, after analyze the test results after conducting relevant experiments, this indicates that both the test plan and the test bench can meet the testing requirements, it will provide relevant basis for differential lock performance and reliability test.