The utility model relates to the technical field of heat dissipation, and discloses a heat dissipation device for a cloud computer, which comprises a heat dissipation mechanism fixedly mounted at the upper end of a base mechanism; the base mechanism comprises a base, the front end and the rear end of the base are open, a fixed rear plate is detachably and fixedly installed at the open position of the rear end of the base, a cold water tank is fixedly installed on the front end face of the fixed rear plate and located in the base, cold water is arranged in the cold water tank, and a
semiconductor chilling plate is fixedly installed at the right end of the cold water tank. The refrigerating end of the left end of the
semiconductor chilling plate penetrates through the right end of the cold water tank, extends into the cold water tank and is in contact with cold water, and the heating end of the right end of the
semiconductor chilling plate is located outside the cold water tank; the heat dissipation mechanism comprises a heat dissipation shell. The all-in-one
machine can be automatically and continuously cooled conveniently, the
cooling effect is better, the all-in-one
machine has an automatic detection function, rapid maintenance is further facilitated, personal belongings can be conveniently stored, and practicability is higher.