The present invention provides a medical supplementary device, which allows a user to be supported on a carrier unit in a prone fashion, such that the carrier unit may provide the user with a large area support, and provide the user with the most secure psychological feeling. Furthermore, the present invention may control the hydraulic cylinder to adjust the overall height, and may lift up a patient lying on the floor while using in connection with a hanging tool. When the carrier unit is in an upright position, it may be provided for a user to walk for rehabilitation. The versatile usage may significantly improve the usage satisfaction of the present invention. Moreover, the present invention can also ensures the usage safety during using and thus well meet the requirement of medical use.
