The invention discloses a preparation method of a partially gelatinized nasal cavity swelling hemostatic sponge on the surface, which comprises such steps as preparation of base frame membrane, modification of base frame membrane, surface coating treatment, solvent replacement, phase separation and pore formation, etc. Drying, compression, assembly, packaging, and sterilization can be completed; the surface of the sponge made by this method is smooth, and the friction force is small; and the surface smooth layer has a microporous structure, which is liquid-permeable and air-permeable; Gelled swelling, stable mechanical properties, can form a wound protective layer; part of the gelled swelling layer is integrated with the main body of the sponge and cannot be separated, when taken out together, there is no residue; the product can be applied to nasal cavity hemostatic sponges, and can also be used on wounds Nursing dressings and sponge cervical dilators and other medical devices.