The utility model relates to a waterproof denoising bridge expansion joint device, which comprises an expansion joint bracket arranged on a bridge supporting base gap. The upper part of the inner cavity of the expansion joint bracket is filled with a sealing expansion body lower than an expansion joint horizontal plane thereof but not lower than half of the thickness of an end plane steel plate thereof. The bottoms of the left end and the right end of the expansion joint bracket are symmetrically provided with the cut-off drainage rubber board with the horizontal angle of Alpha. On the base of the prior expansion joint cut-off denoising technology, the prior whole cut-off rubber board is divided into two small segments which are installed at the two ends of the expansion joint with a certain inclination angle, and at the same time the sealing position of the upper surface of sealant is improved and steel matrix at the two sides of the end plane of the expansion joint is glued. The improved expansion joint device reduces processing, ensures waterproof effect, obviously lowers the noise when vehicles pass and prolongs the service life of the device.