A bridge expansion joint covering device with high safety, which is used to cover the road surface of bridge expansion joints, comprising a rubber body (9) flush with the level of the bridge road surface, and a rubber body (9) inside the rubber body (9). A support body (8), and two extension supports (7) that can move toward and away from the support body (8) and have a symmetrical structure to each other, wherein the two extension supports (7) Each includes a horizontal extension head (721) capable of sliding horizontally in the chute (81) of the support (8), and a vertical extension (72) connected with the horizontal extension head (721) and a support arm (71) connected to the lower end of the vertical extension (72) and extending toward the adjacent bridge structure, wherein the ends of the two extension supports (7) are provided with The supporting plate (73) against which the adjacent bridge structures abut.