Performance testing device and testing method for expansion joint

The invention relates to the technical field of expansion joint processing, and provides an expansion joint performance testing device which comprises a testing table, a fatigue testing device and a threaded lead screw are arranged on the testing table, a sliding block is arranged on the threaded lead screw, a detection device is arranged on the sliding block, the fatigue testing device is further connected with a pressure simulation device, and the pressure simulation device is further connected with a control device. A heat preservation box is arranged on the outer side of the fatigue testing device and the outer side of the threaded lead screw. The thermal insulation box capable of automatically adjusting the temperature and the pressure simulation device are arranged to simulate the actual environment of the expansion joint for testing, so that the accuracy of the whole test result is ensured; according to the invention, accurate positioning is realized by controlling the received compiler pulse number th