Robotic palletizer is applied to various cased or secondary packaged products for automatic conveying, tidy, and palletizing operations. Cases are transffered to differential conveyor and sorted by rotary conveying unit if necessary, arriving to the robot handling position. Depending on different structure of the robot hand, the package can be grasped, sucked or taking to pallet to achieve automatic stacking. It is flexible for different products application in packaging industry with PLC control system, accurate mechanism and sensitive proximate switches, the machine has the feature of stable, low malfunction rate.