Waterproof device for bridge support

The utility model relates to the technical field of bridge support waterproofing, aims to solve the problem that the service life of a bridge support is affected due to the fact that the bridge support is soaked in water for a long time, corrosion of the support is aggravated, and a sliding pair of the support is damaged, and provides a bridge support waterproofing device which comprises an upper plate, a waterproof cover, an elastic displacement device and a lower plate. The upper plate is in sealed connection with the upper portion of the waterproof cover, the lower portion of the waterproof cover is connected with the elastic displacement device, the elastic displacement device is connected with the lower plate, the lower plate is embedded in the side face of an abutment, the elastic displacement device is in non-sealed connection with the waterproof cover and the lower plate, and the beam body, the upper plate, the waterproof cover, the lower plate and the abutment jointly form a semi-closed space. Air pr