The present application discloses a liquid cooling system for a cabinet server, which includes a primary side liquid circulation pipe, a distribution control device, and a secondary side liquid circulation pipe, and the primary side liquid circulation pipe is connected to the water filling device. The distribution control device is connected to the primary side liquid circulation pipe, and the secondary side liquid circulation pipe is connected to the distribution control device and at least one cabinet server. The liquid cooling system of the present application cools the cabinet server by liquid cooling, and the energy efficiency ratio of the liquid cooling system is below 1.3, there is almost no noise, no low filling water temperature is needed, natural cooling source is fully utilized, and the cooling tower can be used to meet the heat dissipation requirement.