Water circulation system of water cooling tower fan

The water circulation system comprises a base, a front shell and a rear shell, the front shell is provided with an air outlet, the rear shell is provided with an air inlet, a containing space is defined by the front shell and the rear shell, the interior of the base is hollow, a water tank cavity is formed in the base, a wet curtain assembly is arranged on the rear shell, a water storage box is fixedly arranged on the rear shell, and a water inlet is formed in the water storage box. The water storage box is provided with a water inlet and a water outlet, the water tank cavity is communicated with the water inlet of the water storage box through a water pipe, the water outlet of the water storage box is located above the wet curtain assembly, a mounting base is fixedly arranged on the base, and a water collecting mechanism used for collecting residual water seeping out of the wet curtain assembly and enabling the residual water to flow back to the water tank cavity is arranged on the mounting base. The water c