The utility model relates to a prefabricated shear wall lateral reserved steel bar positioning and plugging device which comprises a side edge die, a shear plate and a plurality of steel bar clampingpieces, a plurality of reserved grooves corresponding to lateral reserved steel bars of a prefabricated shear wall steel bar cage in position are formed in a side die plate of the side edge die, and the reserved grooves vertically penetrate through the top face of the side die plate. The shear plate is horizontally arranged and is detachably connected to the upper part of the side template; the number of the steel bar clamping pieces is the same as that of the preformed grooves, the positions, corresponding to the preformed grooves in the side molds, of the steel bar clamping pieces are fixedly connected to the bottom face of the shear plate, each steel bar clamping piece comprises a clamping plate capable of blocking the corresponding preformed groove, and notches horizontally penetratingthrough the outer side edges of the clamping plates are formed in the positions, corresponding to the preformed steel bars, of the clamping plates. The device can accurately locate the position of the lateral reserved steel bar of the prefabricated shear wall, can effectively block the reserved notch of the side mold, and does not leak slurry.