The invention discloses an ultrasonic welding device with a cooling type rack. The ultrasonic welding device comprises a welding head, a servo motor driving mechanism, a touch screen, a base and a rack. The welding head is used for ultrasonic welding of a product to be welded, and an armoured platinum thermistor is further arranged on the welding head; the servo motor driving mechanism is electrically connected with the touch screen; the base is used for bearing the product to be welded and is provided with a containing cavity for containing the product to be welded; the rack is used for bearing a support and the base; the rack comprises a working table in contact with the base and four supporting legs which are used for supporting the working table and located on the lower portion of the working table; and the rack is of a hollow structure, the hollow supporting legs and the hollow working table are connected into a cavity, one supporting leg is connected with a first water storage tank through a water inlet pipe, and the other supporting leg is connected with a second water storage tank through a water outlet pipe. The ultrasonic welding device is simple in whole structure, high in practicability, long in service life and easy to use and popularize.