The utility model discloses an install buffer who charges mouthful at electronic bus, including and charging a mouthful medial surface matched with sealing rubber cutting ferrule, the sealing rubber cutting ferrule is the square ring column structure, and sealing rubber cutting ferrule terminal surface is all around through the self tapping screw and mouthful interior bottom surface fixed connection that charges, sealing rubber cutting ferrule both ends face is by outer to interior first ring channel, the two ring shaped groove of being equipped with respectively, and sealing rubber cutting ferrule medial surface central authorities are equipped with annular rubber arch, two ring shaped tank bottom face equipartition has the locating hole that is used for installing self tapping screw. Theutility model discloses an ingenious structural design can play good buffer protection effect to sealing door's switch, possess reliable waterproof dustproof effect simultaneously, and sealed effectis obvious, has effectively reduced the harm of sealing door when closing, can discharge fast getting into inside rainwater through the design of various water conservancy diversion, has improved thelife of electronic bus, has avoided the emergence of incident.