A board process unit includes end supports, pulleys rotatably mounted on the end supports, a carrying belt extending around the pulleys for holding a process board, two parallel screw shafts mounted at opposite sides of the carrying belt, a servomotor for rotating the screw shafts, two moving members each having a boss engaging a screw shaft, first cylinders mounted on the moving members, grasping members mounted relative to the moving members by the cylinders for movement toward and away from the moving members, such that both ends of the carrying belt are adapted to be grasped by the grasping members by moving the cylinders respectively mounted on the moving members, pushing rollers for pushing a process board positioned on the carrying belt, second cylinders for moving the pushing rollers into engagement with the process board, and a processing unit for processing the process board.