The invention discloses an automatic grader for soft-package batteries. The automatic grader comprises a conveying module, a rack module, a lifting module, a manipulator and a control system. The conveying module is that two guide rails are fixedly installed on a conveying rack, an in-place block is fixed on the conveying rack, a slide block is fixedly connected with a conveying plate, and the conveying plate is in transmission connection with a prime mover on the conveying rack through a transmission mechanism. The rack module is that a vertical plate is fixedly connected to the two ends of each of a bottom plate and a connection rod respectively, guide rails are fixedly connected to the two opposite sides of each vertical plate respectively, and N manipulator fixing plates are fixedly connected between the two connection rods; the lifting module is that a cylinder is fixedly installed on the bottom plate, and a cylinder rod is fixedly connected with a container plate; and the control system controls the conveying module, the rack module, the lifting module and the manipulator to work.