This invention relates to a connection device for a round tube eddy current shaft including: a round tube rotor with a magnet and a round tube connector with a conductor enabling said rotor to rotate to generate eddy current after said rotor is plugged into holes in definite gaps to the radial direction, which utilizes a round tube rotor and a connector to transmit the rotation force at one side of the rotor to the connector with an un-contacted way or controls the rotation force at one side of the rotor or designs a magnetization array mode of the magnet on said rotor to meet the need of using the connection device of a round tube eddy current. |