The invention discloses a compact cooling fan. The compact cooling fan comprises an upper shell assembly, a fan, a water tank, a base capable of storing water, a water conveying unit, a humidifying unit, a water distribution unit and an electronic control unit. The upper shell assembly is detachably arranged on the base, and the upper shell assembly is provided with an air inlet and an air outlet.The water tank is detachably arranged on the upper shell assembly, and water is supplemented into the base through the water tank. The humidifying unit is detachably arranged in the upper shell assembly, and the fan is located between the humidifying unit and the air inlet or the air outlet. The water distribution unit is located above the humidifying unit, the water conveying unit is connected with the base, and the water in the base is conveyed to the water distribution unit through the water conveying unit. The electronic control unit is arranged on the upper shell assembly or the base andelectrically connected with the water conveying unit and the fan. The compact cooling fan is reasonable in layout, high in space utilization rate, very compact in massive structure, very small in size and suitable for being used on an office table top, in a bedroom and small space regions.