The utility model provides a bridge speed locking device to reduce the installation requirement on guaranteeing the basis of installation accuracy, increase wear resistance and life. Including cylinder body and piston rod, be provided with the round pin shaft hole on the otic placode of mound body coupling spare, roof beam body coupling spare, the one end of cylinder body, piston rod forms rotatable coupling through the round pin axle that passes the round pin shaft hole with mound body coupling otic placode, roof beam body coupling otic placode respectively, vertical on the bottom plate of mound body coupling spare, roof beam body coupling spare, lateral separation sets up the mounting hole, mound body coupling spare, the roof beam body coupling spare high -strength bolt subassembly through passing the mounting hole respectively with the bridge mound body, roof beam body coupling. The mounting hole is groove hole, and groove hole's length is extended to the direction along horizontal bridge, be provided with bush, bush and round pin axle rotatable coupling through the tight fit in the round pin shaft hole.