The invention discloses a locating device for locating a transverse package A-type frame to a rotary table. The locating device comprises a base (1), a locking structure arranged on the lower surface of the base (1), front locating air cylinders (2) arranged on the upper surface of the base (1), rear locating guide rolls (3), a left locating air cylinder (4), a right locating air cylinder (5) and a plurality of floating air cylinders (6) in linkage. The locking structure is used for locking the transverse package A-type frame to the rotary table. The floating air cylinders (6) are connected through balance plates (61). The balance plates (61) are used for containing the transverse package A-type frame (7). The front locating air cylinders (2) and the rear locating guide rolls (3) are matched to locate the transverse package A-type frame (7) in the front-back direction. The left locating air cylinder (4) and the right locating air cylinder (5) are matched to locate the transverse package A-type frame (7) in the left-right direction. Therefore, transverse loading on a glass substrate is achieved, and the loading efficiency of the glass substrate is improved.