The utility model relates to a trestle expansion joint device. The trestle expansion joint device consists of a steel plate, an upper bridging panel and a lower bridging panel, wherein the upper bridging panel is adjacent to the lower bridging panel; the steel plate is arranged in a clearance between the upper bridging panel and the lower bridging panel; right-angled notches are formed in one side, in connection with the upper bridging panel, of the steel plate; the right-angled notches are grouped two by two and are symmetric to each other; 20a-type steel is arranged between the symmetric right-angled notches and is welded with the upper bridging panel; and one side, without the right-angled notches, of the steel plate is welded with the lower bridging panel. By virtue of the trestle expansion joint device, the deformation and damage of a trestle steel component caused by temperature change and traction force can be effectively prevented, and the deformation and damage of a trestle distribution beam caused by application of a concentrated load to the trestle distribution beam can be effectively avoided. Meanwhile, the trestle expansion joint device also serves as a trestle speed reduction device, so that the service life of the trestle steel component is prolonged to a large extent, the driving safety and comfort of a trestle are improved, and the maintenance rate of the trestle is greatly reduced.