A cabinet liquid cooling system, configured to dissipate heat of a cabinet, wherein the cabinet liquid cooling system comprises: a flow allocation unit, wherein the flow allocation unit is installed on a side wall of the cabinet, is located in space between the side wall of the cabinet and a mounting bar of the cabinet, and is configured to deliver and recycle liquid, and the flow allocation unit is provided with a liquid inlet and a liquid outlet; an LCS control unit; multiple liquid supply branches in a one-to-one correspondence to multiple device handle bars, wherein each of the liquid supply branches supplies cooling liquid to an electronic device disposed in the device handle bar, and each of the liquid supply branches comprises a liquid delivery pipe and a liquid return pipe that communicate with the flow allocation unit; multiple node pipes in a one-to-one correspondence to the multiple liquid supply branches, wherein each of the node pipes comprises a liquid inlet pipe and a liquid outlet pipe; and multiple pairs of quick female connectors and quick male connectors that cooperate with each other, wherein the liquid inlet pipe of each of the node pipes is connected to the liquid delivery pipe of the corresponding liquid supply branch by using the quick male connector and the quick female connector, and the liquid outlet pipe of each of the node pipes is connected to the liquid return pipe of the corresponding liquid supply branch by using the quick male connector and the quick female connector; and the cooling liquid enters the flow allocation unit from the liquid inlet under control of the LCS control unit, enters the interior of the corresponding device handle bar to perform heat dissipation by successively passing through the liquid delivery pipe and the liquid inlet pipe, and then flows back to the flow allocation unit by successively passing through the liquid outlet pipe and the liquid return pipe; wherein the quick female connector and the quick male connector are mutually suspended and inserted for cooperation, and are fastened by using a slidable sleeve; the slidable sleeve, the quick female connector, and the quick male connector are coaxial, and the slidable sleeve is axially movable; the LCS control unit is installed at the bottom of the cabinet, and cyclically supplies liquid to the flow allocation unit by using the liquid inlet and the liquid outlet; characterized in that the quick female connector and the slidable sleeve are clamped and secured by using a mounting bracket, the mounting bracket is formed by butting a lower mounting bracket and an upper mounting bracket that have a same structure, is locked by using a screw or a bolt and a tapped hole that is provided on the mounting bracket, and is then securely installed on an inner side of the side wall of the cabinet by using a screw or a bolt. a flow allocation unit, wherein the flow allocation unit is installed on a side wall of the cabinet, is located in space between the side wall of the cabinet and a mounting bar of the cabinet, and is configured to deliver and recycle liquid, and the flow allocation unit is provided with a liquid inlet and a liquid outlet; an LCS control unit; multiple liquid supply branches in a one-to-one correspondence to multiple device handle bars, wherein each of the liquid supply branches supplies cooling liquid to an electronic device disposed in the device handle bar, and each of the liquid supply branches comprises a liquid delivery pipe and a liquid return pipe that communicate with the flow allocation unit; multiple node pipes in a one-to-one correspondence to the multiple liquid supply branches, wherein each of the node pipes comprises a liquid inlet pipe and a liquid outlet pipe; and multiple pairs of quick female connectors and quick male connectors that cooperate with each other, wherein the liquid inlet pipe of each of the node pipes is connected to the liquid delivery pipe of the corresponding liquid supply branch by using the quick male connector and the quick female connector, and the liquid outlet pipe of each of the node pipes is connected to the liquid return pipe of the corresponding liquid supply branch by using the quick male connector and the quick female connector; and the cooling liquid enters the flow allocation unit from the liquid inlet under control of the LCS control unit, enters the interior of the corresponding device handle bar to perform heat dissipation by successively passing through the liquid delivery pipe and the liquid inlet pipe, and then flows back to the flow allocation unit by successively passing through the liquid outlet pipe and the liquid return pipe; wherein the quick female connector and the quick male connector are mutually suspended and inserted for cooperation, and are fastened by using a slidable sleeve; the slidable sleeve, the quick female connector, and the quick male connector are coaxial, and the slidable sleeve is axially movable; the LCS control unit is installed at the bottom of the cabinet, and cyclically supplies liquid to the flow allocation unit by using the liquid inlet and the liquid outlet; characterized in that the quick female connector and the slidable sleeve are clamped and secured by using a mounting bracket, the mounting bracket is formed by butting a lower mounting bracket and an upper mounting bracket that have a same structure, is locked by using a screw or a bolt and a tapped hole that is provided on the mounting bracket, and is then securely installed on an inner side of the side wall of the cabinet by using a screw or a bolt.