The invention belongs to the field of location clamping mechanisms and discloses a location clamping mechanism for a clamping piece sawing automation device. The mechanism comprises a clamping cylinder, a support block, a sliding block, a location block, a sliding seat, a vertical stopping block, a transverse stopping block, a hexagonal nut, a double-end bolt, an ejection disc, a discharging cylinder, a sawing machine body and a guide rail pair. A lower guide rail of the guide rail pair is fixed on the sawing machine body, the lower guide rail and the transverse center of a sawing belt are located on the same vertical face, an upper guide rail of the guide rail pair is a sliding seat, a transverse stopping block is fixed on the right side of the sliding seat through the double-end bolt and the hexagonal nut, a vertical stopping block perpendicular to the transverse stopping block is connected with one side of the sawing machine body, the location block is arranged on the right side of the sliding seat, a clamping piece small end hole is formed in the location block, the support block is fixed on the left side of the sliding seat through the double-end bolt, the clamping cylinder is fixed at the center of the support block, and a discharging cylinder is connected with the outer end of the ejection disc. The mechanism has the advantages of reducing labor intensity, being high in production efficiency and capable of achieving production automation.