A joint device, comprising: two connection parts (81,82) pivotally connected to each other; a first latch capable of being selectively moved to a first locking position for locking the two connection parts (81,82) or a first unlocking position for unlocking the two connection parts (81,82); and an actuating mechanism disposed adjacent to where the two connection parts (81,82) are pivotally connected, the actuating mechanism being connected to the first latch to be operable to selectively move the first latch to the first locking position or the first unlocking position, wherein the actuating mechanism comprises a first resilient part urging against the first latch, and the first resilient part pushes the first latch so that the first latch has a tendency to move to the first locking position; the actuating mechanism further comprises a first pushing part, and the first pushing part is operable to push the first latch so that the first latch moves to the first unlocking position; the joint device further comprises a supporting part fixedly connected to one of the two connection parts (81,82), the first pushing part being slidably connected to the supporting part, a movement direction (D1,D2) of the first pushing part being parallel to a movement direction (D1,D2) of the first latch; and the actuating mechanism further comprises an operation part pivotally connected to the supporting part, the operation part comprises an operation driving part, the first pushing part comprises a pushing follower in coordination with the operation driving part, and the operation driving part is capable of rotating to drive the pushing follower to move so that the first pushing part slides to push the first latch, characterized by further comprising a second latch capable of being selectively moved to a second locking position of locking one of the two connection parts (81, 82) and the operation part or a second unlocking position of unlocking one of the two connection parts (81, 82) and the operation part. two connection parts (81,82) pivotally connected to each other; a first latch capable of being selectively moved to a first locking position for locking the two connection parts (81,82) or a first unlocking position for unlocking the two connection parts (81,82); and an actuating mechanism disposed adjacent to where the two connection parts (81,82) are pivotally connected, the actuating mechanism being connected to the first latch to be operable to selectively move the first latch to the first locking position or the first unlocking position, wherein the actuating mechanism comprises a first resilient part urging against the first latch, and the first resilient part pushes the first latch so that the first latch has a tendency to move to the first locking position; the actuating mechanism further comprises a first pushing part, and the first pushing part is operable to push the first latch so that the first latch moves to the first unlocking position; the joint device further comprises a supporting part fixedly connected to one of the two connection parts (81,82), the first pushing part being slidably connected to the supporting part, a movement direction (D1,D2) of the first pushing part being parallel to a movement direction (D1,D2) of the first latch; and the actuating mechanism further comprises an operation part pivotally connected to the supporting part, the operation part comprises an operation driving part, the first pushing part comprises a pushing follower in coordination with the operation driving part, and the operation driving part is capable of rotating to drive the pushing follower to move so that the first pushing part slides to push the first latch, characterized by further comprising a second latch capable of being selectively moved to a second locking position of locking one of the two connection parts (81, 82) and the operation part or a second unlocking position of unlocking one of the two connection parts (81, 82) and the operation part.