The invention relates to an experimental device for biomechanical property testing of a patellar joint. The experimental device comprises a framework assembly and a joint assembly, wherein the framework assembly adopts a framework structure, and the joint assembly is mounted on the framework assembly; an ankle part at the bottom of the joint assembly is connected with a framework bottom plate through a bolt, a guide rail sliding block in the joint assembly is fixedly connected with a linear guide rail sliding block in the framework assembly through a bolt; an adjustment screw rod in the joint assembly and a screw rod sleeve in the framework assembly form a threaded pair, and bending of a knee joint model is realized by rotating the adjustment screw rod to adjust the position of the top of joint assembly. The experimental device can be used for simulating biomechanics of the patellar joint at different bending angles of the knee joint. The bending angle of the knee joint can be adjusted as required, and the experimental device is reliable in fixation and can guarantee correctness of an experiment.