Cooling fan

The invention provides a cooling fan. The cooling fan comprises a basic rack; a water tank, a lock catch and a notch part; the water tank is movably connected to the basic rack; the lock catch is arranged on the basic rack, and the lock catch is provided with a locking position located on the moving path of the water tank and an unlocking position separated from the moving path of the water tank; the notch part is arranged on the face, facing the basic rack, of the water tank, the notch part is right opposite to the lock catch, and when the lock catch is located at the locking position, the lock catch extends into the notch part; and the water tank is embedded in the basic rack, and the surface, facing the basic rack, of the water tank is mainly the water tank side wall and the water tank bottom. When the notch part is formed in the side wall of the water tank, the water tank is installed in the basic rack, the side wall of the basic rack is within the range of the notch part, as the notch part is located on