Prefabricated box girder expansion joint embedded bar positioning device

The invention relates to the technical field of bridge construction, and discloses a prefabricated box girder expansion joint embedded bar positioning device which comprises two guide rails, the two guide rails are parallel to each other, sliding seats are slidably arranged at the top ends of the two guide rails, telescopic columns are fixedly mounted at the top ends of the two sliding seats, and rotating seats are rotatably mounted at the top ends of the telescopic columns; a telescopic supporting beam is connected between the two rotating seats, and a plurality of supporting rods are connected to the bottom end of the telescopic supporting beam; accurate movement and positioning of the expansion joint embedded bars in the longitudinal direction, the corner direction, the vertical direction and the transverse direction can be achieved, the situation that due to the fact that the installation precision of the embedded bars in a traditional technology is low, broken welding and re-welding or repeated steel bar