The invention discloses a fluid cooling assembly which can promote generation of a turbulence in the assembly so as to achieve a good heat dissipation effect. The cooling assembly includes a closed chamber comprising an inlet and an outlet which allow fluid to pass through; a heat dissipation device, a plurality of micro columns, and a plurality of heat dissipation fins are positioned in the cooling assembly; when the fluid passes through the chamber, those element combinations generate an enhanced turbulence, so that heat can be effectively dissipated from the heat dissipation by the fluid.