The utility model relates to a prefabricate positioner of assembling of stand and cushion cap relates to bridge structures construction technical field. The main technical scheme who adopts does: a prefabricate positioner of assembling of stand and cushion cap for in the assembling of prefabricated stand and cushion cap, will prefabricate the stand location on the cushion cap, its characterized in that, the device includes: bottom surface elevation adjusting device for the arrangement is on the cushion cap, with right the bottom surface elevation of prefabricated stand on the cushion cap is rectified, the location frame is used for fixing on the cushion cap, with right prefabricated stand is in horizontal position on the cushion cap advances line location, straightness adjusting device hangs down, it is used for connecting prefabricated stand to hang down straightness adjusting device's upper end, and the lower extreme is used for fixing at cushion cap or location frame to rectify the straightness that hangs down of prefabricated stand. The utility model discloses mainly used is assembled the scene of prefabricated stand and is carried out the accurate positioning, improves the assembly accuracy between prefabricated stand and the cushion cap.