The invention discloses an efficient and energy-saving cold hot warm water dispenser. The efficient and energy-saving cold hot warm water dispenser comprises a water dispenser module and an ejector module, wherein the water dispenser module comprises a water bucket, a buffer tank, a boiled water tank, a warm boiled water tank and a cold water tank; and the ejector module comprises a No.1 heat exchanger, a generator, a nozzle, an ejection opening, an ejector, a condenser and a capillary layer. According to the cold hot warm water dispenser, the ejector module is added to recycle a part of energy of boiled water, and the part of energy is used for driving the ejector to operate to achieve refrigeration; compared with compression refrigeration or semiconductor refrigeration, jet refrigerationhas the advantages that the structure is simple, moving parts are eliminated, construction cost is low, and the like; more importantly, except from electric heating wires, extra electric energy is not consumed, and drinking water at cold, hot and warm temperatures can be acquired at the same time; the energy utilization rate of the water dispenser is greatly increased; and the buffer tank is added between a water inlet seat and the boiled water tank, so that utilization efficiency of energy is further improved.