Abstract: A positioning device is configured to position a workpiece having a location hole. The positioning device includes a supporting member for supporting the workpiece, at least one positioning member, and at least one pressing module mounted on the supporting member. Each of the at least one positioning member includes a driving portion and a locating pin coupled to the driving portion. The driving portion is operable to drive the locating pin to be stretched into the location hole. The pressing module includes a driving member and a pressing member coupled to the driving member. The driving member is used to drive the pressing member press the workpiece after the locating pin stretched into the location hole, and the driving portion is further configured to drive the locating pin move out of the location hole after the pressing member pressed the workpiece.