Computer water cooling system

The utility model relates to the technical field of computer water cooling, in particular to a computer water cooling system which can be used as a notebook computer cooling support while cooling a host of a desktop computer. When the notebook computer is cooled; the two stop bearing plates are rotated out; a notebook computer is placed on the water-cooling heat dissipation plate; the angle rotating air cylinder drives the water-cooling heat dissipation plate to rotate by a moving inclination angle; the height of the notebook computer is adjusted; the two stop bearing plates prevent the notebook computer from slipping off; and then the water-cooling heat dissipation plate cools and dissipates heat of the notebook computer and plays a role of a heat dissipation support, and when the notebook computer support is used as the notebook computer support, the two adjusting screw rods can be adjusted to drive the two adjustable supporting legs to be supported on the table top under the condition that the table top is