Expansion joint device

The invention relates to an expansion joint device. The device comprises two supporting seats and a plurality of connecting seats, the connecting seats are sequentially arranged in the length direction of a bridge expansion joint, each connecting seat is connected between the two beam ends of a bridge, and therefore a supporting face used for bearing loads is formed, so that the supporting seats can replace a comb tooth structure of a traditional expansion joint, and the supporting seats play a bearing role in the position between the two beam ends of the bridge. Moreover, the two ends of each connecting seat are rotationally connected with the supporting seats on the corresponding sides through ball head pieces correspondingly, so that by means of the rotating effect of the ball heads, the ball head pieces can effectively compensate movement between the beam ends on the two sides of the bridge no matter the beam ends generate longitudinal or transverse displacement or rotation angles, the ball head pieces ev