Expansion joint device capable of preventing beam from falling

The utility model discloses an anti-beam-falling expansion joint device which comprises a fixed plate and a joint-crossing movable plate which are oppositely arranged, a plurality of first comb teeth are arranged at the inner end of the fixed plate, a plurality of second comb teeth are arranged at the inner end of the joint-crossing movable plate, and the first comb teeth and the second comb teeth are arranged at intervals in a staggered mode. A widened first comb tooth head is arranged at the top end of each first comb tooth, and a widened second comb tooth head is arranged at the top end of each second comb tooth; the width of each second comb tooth head is larger than the gap between every two adjacent first comb tooth heads. According to the anti-beam-falling expansion joint device, the displacement of the beam end of a bridge can be limited during an earthquake, the beam end cannot be separated at the position of the expansion joint, beam falling of the beam end is prevented, and the safety performance i