The present invention describes a cooling unit for a central processing unit (the CPU) that comprises two flat grooved plates fastened together that jointly form at least one channel that is sealed by hermetic insert blocks wherein the cooling liquid circulates. These plates have heat-dissipating properties for heat-generating electronic components of the CPU contacting with them, while the channel in which the cooling liquid circulates has an inlet and an outlet, to supply and discharge the cooling liquid, respectively. The technical result of the proposed technical solution is to increase the effectiveness and efficiency of a cooling system for the CPU, simplify its design, improve reliability characteristics, and reduce energy consumption of the cooling system.