Cold water machine is a water cooling device, is able to provide a constant temperature, constant current, constant voltage cooling equipment. Cold water machine principle to a certain amount of water into the machine's internal water tank through a cold water machine cooling system, water cooling, and then there are inside the machine and pump the frozen water injection cooling device, cooling water machine internal heat, high temperature hot water once again return to the water tank to cool, so the cycle exchange cooling, reach for the equipment cooling effect. Cooling water temperature can be adjusted automatically according to requirements, long-term use can save water. So cold water machine is a kind of standard energy-saving equipment.