The present invention is to provide a locking assembly including a joint device and a safety lock mechanism. The joint device includes a first joint component, a second joint component and a button assembly. The second joint component is pivoted to the first joint component. The button assembly is slidably disposed between the first joint component and the second joint component, and the button assembly is for locking a pivotal movement of the first joint component and the second joint component. The safety lock mechanism movably passes through the second joint component to selectively engage with the button assembly, so as to lock the button assembly selectively. Therefore, it increases the operating safety.