The invention discloses a wet curtain having an air purifying effect and a preparation method thereof. The wet curtain having the air purifying effect is formed by bonding corrugated water absorption cooling pieces; and the water absorption cooling pieces are coated with compositions consisting of magnetic powder, tourmaline powder, absorption powder and thermosetting resins. The wet curtain has excellent cooling and air purifying effects, and can be recycled after simple cleaning to achieve the effects of economy and environmental protection.