Bridge expansion joint

The invention relates to the technical field of bridge facility construction, in particular to a bridge expansion joint. The bridge expansion joint comprises a first support, a second support, a first waterproof piece, a mounting base, a plurality of swing supporting legs, a plurality of telescopic supporting legs and a protective layer. And a gap is formed between the second support and the first support. The mounting base is located in the gap. One end of each swing supporting leg is rotatably connected with the mounting base, and the other end of each swing supporting leg is connected with the first support or the second support. One end of each telescopic supporting leg is connected with the mounting base, and the other end is connected with the first waterproof piece. When a part of position on the first waterproof part is stressed, the force is redistributed through the multiple telescopic supporting legs, the multiple swing supporting legs and the mounting base and is transmitted to the first support a