Efficient and energy-saving data center water cooling system

An efficient and energy-saving data center water cooling system comprises a water chilling unit and a plurality of chip heat dissipation units. Each chip heat dissipation unit comprises a heat sink body and a micro-channel part; the heat sink body is provided with a plurality of main heat dissipation cavities, a plurality of flow channels, a water inlet and a water outlet; the micro-channel part is arranged in the main heat dissipation cavities; and the water inlet, the flow channels, the main heat dissipation cavities and the water outlet form a cooling water loop. The water inlets and the water outlets are communicated with the water chilling unit through pipelines. Based on a special efficient heat sink design, the water chilling unit can operate in a small-flow, large-temperature-difference and high-outlet-water-temperature mode, the energy efficiency ratio of the unit is increased, and the driving energy consumption of water path circulation of the system is reduced. That is to say, the energy consumptio