The invention relates to the field of machinery, in particular to an arc plate positioning split bearing comprising an upper bearing block, a lower bearing block and a base, wherein bearing mounting grooves are respectively arranged inside the upper bearing block and the lower bearing block, the lower bearing block is connected with the base, a convex plate is arranged below the upper bearing block and embedded in the lower bearing block, and the upper bearing block and the lower bearing block are connected firmly by a coupling bolt. In the invention, the upper bearing block and the lower bearing block are connected by the convex plate, and the convex plate is used for mainly bearing axial load so as to increase the axial load carrying capacity of the bearing blocks; compared with the traditional detent positioning mode, the mode of the convex plate embedding has more compact structure and is more suitable for the condition of narrow installation positions; during assembly and disassembly, the installation and the maintenance are easy and rapid due to the convex plate positioning; and multiple upper bearing blocks can share one lower bearing block so as so to increase the stiffness and strength of the base. Moreover, the arc plate positioning split bearing has low cost and is easy to promote.