Combined data center cooling system

A combined type data center cooling system comprises a liquid cooling unit and a mechanical refrigeration unit for assisting the liquid cooling unit. The liquid cooling unit comprises a dry cooler module, the dry cooler module is communicated with a liquid separator in the cold plate liquid cooling cabinet through a cooling liquid circulating pump to convey cooling liquid, the liquid separator is communicated with a plurality of groups of liquid cooling servers to perform liquid separation, and the other end of each liquid cooling server is communicated with the cooling liquid circulating pump through a liquid collector to perform circulating backflow; the mechanical refrigeration unit comprises an evaporative cooling device arranged in the cold plate liquid cooling cabinet, and the evaporative cooling device is circularly communicated with the condenser module to realize auxiliary cooling of the cold plate liquid cooling cabinet. According to the utility model, a mode of combining liquid cooling, fluorine co