A cabinet liquid cooling system is configured to dissipate heat of a cabinet. A flow allocation unit is installed on a single side of the cabinet, is located in space between a side wall of the cabinet and a mounting bar of the cabinet, and is provided with a liquid inlet and a liquid outlet. A liquid cooling system (LCS) control unit is installed at the bottom of the cabinet and cyclically supplies liquid to the flow allocation unit using the liquid inlet and the liquid outlet. A liquid supply branch includes a liquid delivery pipe and a liquid return pipe. A node pipe includes a liquid inlet pipe and a liquid outlet pipe. Both the liquid inlet pipe and the liquid outlet pipe are connected to the corresponding liquid delivery pipe and liquid return pipe using the quick male connector and the quick female connector.