The invention relates to a limiting device. The limiting device is arranged on a medical soft tissue suturing device and is used for limiting a propulsion progress of a needle part of the medical soft tissue suturing device. The limiting device comprises pressing parts arranged at the two sides and a middle moving part, wherein a wide slot and a narrow slot are formed in the middle moving part; the limiting device is arranged on the lower shell of the medical soft tissue suturing device, and sliding grooves matched with the wide slot and the narrow slot in the upper shell of the medical soft tissue suturing device slide in the wide slot and the narrow slot or are blocked on a '1'-shaped blocking column by pressing the pressing parts arranged at the two sides and moving the middle moving part, so as to realize propulsion or stop of the needle part of the medical soft tissue suturing device. The limiting device provided by the invention can overcome the defects that excessive propulsion or insufficient propulsion stroke can be easily caused by a nonuniform force, propulsion needs to be carried out again and operation accuracy and efficiency are influenced when the propulsion progress of a propulsion part is controlled by virtue of bulges and corresponding limiting holes.