The invention discloses a wet curtain for an evaporating type cooling fan and a preparation method of the wet curtain. The wet curtain for the evaporating type cooling fan is formed by adhering wave-shaped water absorbing radiating plates which are coated with magnetic/ electric resin compositions, wherein the magnetic/ electric resin compositions include magnetic power, tourmaline powder and heat convertible resin. According to the wet curtain for the evaporating type cooling fan, the surface is provided with the magnetic and electric functional coating, so that the surface tension of water can be reduced, the steam pressure can be reduced, and therefore, the water evaporating rate can be obviously increased, and the cooling is sped up.