A connecting mechanism includes a first connecting member, a second connecting member, a first conduit and a second conduit. The first connecting member includes a first cylinder and a first piston movably accommodated within the first cylinder to divide the first cylinder into a first space on the one side of the first piston and a second space on the opposite side of the first piston. The second connecting member includes a second cylinder and a second piston movable accommodated within the second cylinder to divide the second cylinder into a third space on the one side of the second piston and a fourth space on the opposite side of the second piston. The first conduit communicates the first space with the third space. The second conduit communicates the second space with the fourth space. An electronic device using the connecting mechanism is also provided.