The utility model provides a computer water-cooling heat dissipation device, relates to the technical field of computer water-cooling heat dissipation, and aims to solve the problem that the size of a display screen of a CPU (
central processing unit) water-cooling heat dissipation device is limited in the prior art, the computer water-cooling heat dissipation device comprises a water-cooling heat dissipation mechanism, and the water-cooling heat dissipation mechanism comprises a cold head, a water-
cooling pipe, a cold row and a
holographic screen fan. The cold head is connected with the cold row through the water-
cooling pipe, a circulation loop is formed among the cold head, the water-
cooling pipe and the cold row, and the
holographic screen fan is installed on the water-cooling heat dissipation mechanism. According to the computer water-cooling heat dissipation device, the
holographic screen fan is installed on the basis of an original water-cooling heat dissipation
system, in the limited space of a desktop computer, on the premise that the maintenance convenience of the computer is not affected, on one hand, a display screen with a larger size can be provided for a CPU processor water-cooling heat dissipation device through the fan holographic screen, and on the other hand, the display screen can be provided for the computer water-cooling heat dissipation device; on the other hand, active heat dissipation can be provided for the mainboard through the fan.