The invention provides a protecting device of a stent, a manufacturing method of the protecting device, and a medical device. The protecting device comprises a restraining sheath and a protecting sheath, and a first window is formed in the body wall of the restraining sheath; the part of the protecting sheath is located in an accommodating space formed by the restraining sheath, and the stent is located in an accommodating space formed by the protecting sheath; the protecting sheath comprises a notch which extends in the axial direction of the protecting sheath to make the protecting sheath form a first part and a second part which are mutually separated; and the first part penetrates through the first window so as to guide the first part to be separated relative to the second part. Basedon the protecting device of the stent, radial restraining force can be provided for the stent, the protecting device cannot generate friction with the outer surface of the stent when being taking downfrom the stent, the whole operation process is easy when the protecting device is taken down from the stent, one person can operate, and the working efficiency is improved.