Fully-sealed bridge expansion device

A fully-sealed bridge expansion device comprises a first beam body, a second beam body and an expansion component, an expansion joint is formed between the first beam body and the second beam body, mounting notches are formed in the beam end of the first beam body and the beam end of the second beam body, corresponding height adjusting assemblies are mounted in the mounting notches, and the expansion component is mounted on the height adjusting assemblies. Waterproof components are installed in the expansion joints, spring assemblies are installed between the expansion components, and the installation notches are filled with elastic sealing pieces. According to the fully-sealed bridge expansion device, the gap between the expansion device body and the mounting notch is made of the elastic rubber sealing material and is formed in a cast-in-place mode, the gap between the expansion device and the notch can be filled, seamless connection of the expansion device and the notch is achieved, the water sealing effect