Abstract: The application relates to a swinging device, underwater bionic propeller and use thereof. The swinging device can include a swing mechanism including a swing arm. A driving end of a steering mechanism can be in transmission connection with the swing arm so as to drive the swing arm to swing in a reciprocating manner. A reciprocating mechanism can be provided which is in transmission connection with a fixed end of a steering driving component so as to drive the swing arm to rotate in a reciprocating manner by driving the steering mechanism to move. The steering mechanism drives the swing arm independently and changes the swinging area that the reciprocating mechanism drives the swing arm to swing in a reciprocating manner.