The invention provides a joint bearing dust cover waterproof tester comprising a swing mechanism, a long shaft, a supporting base, a short shaft, a workpiece fixing plate, a slide rod and a swing plate. The swing mechanism is connected with one end of the long shaft and the long shaft is enabled to rotate around the axis in a reciprocating way through the swing mechanism. The other end of the longshaft is installed on the experiment joint bearing inner race. An installing base is fixed on the workpiece fixing plate. The experiment joint bearing outer race is installed in the installing base.One end of the short shaft is supported by the supporting base. The swing plate is installed on the other end of the short shaft. The joint bearing is embedded in the swing plate. One end of the sliderod penetrates into the joint bearing, and the other end of the slide rod and the long shaft are fixed. The swing plate is enabled to rotate around the axis of the short shaft in a reciprocating waythrough reciprocating rotation of the long shaft. The workpiece fixing plate and the swing plate are connected. The simple mechanism can be used, and one micro-motor and the connecting rod mechanism are applied to simultaneously drive the product to perform circumferential and left and right swinging.