Liquid level display device for cold bath equipment

A liquid level display device for cold bath equipment comprises a water tank and a liquid level displayer, the upper end of the liquid level displayer is connected with one end of an upper communicating pipe, the other end of the upper communicating pipe is connected with the top end of a dryer, and the two ends of the upper communicating pipe are further connected with an upper sealing opening in the upper end of the water tank through a breathing pipe. A lower communication assembly is connected between the lower end of the water tank and the lower end of the liquid level display; the liquid level is observed through the liquid level displayer, when the liquid level reaches the lower limit, the movably-connected sealing cover is opened, and freezing circulation liquid is injected into the liquid level displayer through the funnel to reach the proper liquid level. If the refrigeration circulation liquid needs to be discharged, the stop valve is opened to discharge the liquid and then closed; in the using pro