The present invention provides a cup lid including a top shield, at least two ring shields, and at least two snap-on components. The ring shields extending from a lower edge of the top shield downward are peripherally spaced from each other. Each snap-on component extends from the lower edge of the top shield downward and is arranged between two adjacent ring shields. Each snap-on component includes a U-shaped border, a tab, and at least one Y-shaped resisting member. The U-shaped border and the top shield define an opening. The tab extends from the U-shaped border outward. The Y-shaped resisting member extends from an interior of the U-shaped border upward and is bendably held in the opening. The cup lid can be fitted on a cup body or separated from the cup body through the Y-shaped resisting members without a further operation step for repeated utilization and environmental effect.