Waterproof cap

The utility model is applicable to the field of building materials, and particularly relates to a waterproof cap which comprises a through pad body connected with a cap body. And a concave cavity is formed in the cushion body. When the screw is inserted into the through pad body for use and the concave cavity formed in the pad body is extruded by the screw, air in the concave cavity at the contactposition of the pad body and the block material is extruded to form a vacuum state, the pad body can be tightly attached to the block material, the sealing performance after connection is effectivelyenhanced, and then the cap body is used for covering, so that double waterproof protection is realized, and the waterproof performance of the ceiling is stronger; installation screws can be effectively protected from being affected with damp, the service life of the ceiling is effectively prolonged, and meanwhile the effect of protecting the panel from being eroded by rain, snow and the like is achieved. 本实用新型适用于建筑材料领域，具体