Abstract: A liquid changer includes a base, a liquid tank, a pump and a changeover valve. The base has two insert grooves for the liquid tank and the pump to fit therein to stand up. The changeover valve is located at one side of the pump. Switching the changeover valve to IN or OUT position can pump out the liquid in the liquid tank or exhaust out the liquid in a container of any other use. Thus the liquid changer can be used in two ways by means of the changeover valve easily switched. In addition, the pump is located outside the liquid tank, increasing liquid volume to be stored in the liquid tank.