An environmentally-friendly, anti-contamination suction-nozzle beverage cup cover includes a cover body connected to a beverage cup and formed with a suction nozzle mounting chamber at the top of the cover body, a tube insertion hole formed in the mounting chamber, a suction nozzle disposed in the tube insertion hole, a swing sleeve provided outside the suction nozzle and formed with a swing pin fitted into the swing holes, swing holes formed in both sides of the mounting chamber, a connecting ear formed at one side of the cover body, a clamp and a safety catch disposed on and fixed with the connecting ear via a shaft, a return ejector spring disposed in the clamp, a shield disposed on the cover body and in contact with the head of the suction nozzle. The head of the shield is formed with a clamp rib that matches the clamp.