Sliding cover one-key opening type cup cover

The utility model discloses a sliding cover one-key opening type cup cover which comprises a cover body, a drinking opening is formed in the top end of the cover body, a vertical sliding way is arranged in the center of the bottom wall of an installation cavity in the top end of the cover body, a middle bolt is arranged in the sliding way in a sliding mode, and a pressing head is arranged at the top of the middle bolt. The lower end of the middle bolt downwards extends below the slideway and is detachably provided with a mounting bracket, one side of the mounting bracket is provided with a sealing element, and the bottom of the drinking port is blocked through the sealing element; a sliding cover is slidably arranged at the top end of the cover body and can slide back and forth along the cover body, and in a natural state, the sliding cover is located at a front limit position, and at the moment, the middle plug drives the sealing piece to seal the drinking opening; when the sliding cover slides backwards til