The invention discloses a preparation method of a medical hemostatic occlusion dressing. The preparation method comprises the following steps: (1), taking and pouring deionized water into a reactor, heating the reactor, slowly adding lemon peel pectin and gelatin, and mechanically stirring at the same time; (2), after the addition of the lemon peel pectin and gelatin, stirring continuously, then adding other components into the reactor, and carrying out mechanical stirring uniformly at the same time; (3), after the mixing of the materials, cooling hydrogel to be at a room temperature, so as to obtain the medical hemostatic occlusion dressing. The medical hemostatic occlusion dressing prepared through the method provided by the invention is high in bleeding stopping speed, has auxiliary functions of promoting wound surface healing, preventing adhesion and the like, is also better in biomechanics and air permeability, and has an important clinical application value; the preparation method provided by the invention has the advantages that the process is simple, requirements for equipment are relaxed, raw materials are low in cost and readily available, the cost is low, and industrialization is easy to realize.