The utility model relates to an ultrasonic washing device in a shoe production line, comprising a water washing device which is composed of a water tank, a conveying chain and an ultrasonic generator, a baking oven, a conveying belt which is arranged in the baking oven and an automatic rolling wheel which is connected between the water washing device and the conveying belt of the baking oven. The conveying chain comprises an upper layer conveying belt and a lower layer conveying belt which are automatically cyclical and arranged in the water washing device, and the upper and the lower layer conveying belts coincide together and are used for holding workpieces. A movable sheet is arranged on the respective coupling joint of the inner side surfaces of the two opposite chain sheets of the upper layer conveying belt, and the other end of the movable sheet is fixedly provided with a batten. The holding height can be automatically adjusted according to the thickness of the workpieces.