Expansion joint device

The utility model discloses an expansion joint device, and relates to the technical field of expansion joints, the expansion joint device comprises two groups of fixing rods which are respectively fixed in a first expansion main body and a second expansion main body, a main plate is slidably connected between the two groups of fixing rods, and a buffer mechanism is arranged on the upper side of the main plate; the buffer mechanism comprises a limiting frame plate fixedly connected to the upper side of the main plate, a buffer spring and a U-shaped elastic block are fixedly connected to the interior of the limiting frame plate, a pressurizing plate is fixedly connected to the upper side of the buffer spring, and a buffer plate is fixedly connected to the upper side of the pressurizing plate. The limiting frame plate can play a role in fixing and limiting the buffer spring and the U-shaped elastic block, so that the buffer spring and the U-shaped elastic block are firmer, more stable and not prone to deviation