The invention discloses an adhesive self-repairing hemostatic membrane and a preparation method thereof. The hemostatic membrane is prepared by the following steps od fully reacting dopamine grafted oxidized alginic acid, acrylamide, acrylic acid N-hydroxysuccinimide ester and N, N'-methylene bisacrylamide, adding a coagulation crosslinking agent, acrylic acid and a first part of a photoinitiator,carrying out pre-polymerizing, and adding a mixed solution of acrylate PEG-N hydroxyl succinimide ester, dopamine, acrylamide, acrylic acid N-hydroxyl succinimide ester and a second part of photoinitiator, fully polymerizing, and carrying out programmed vacuum drying to obtain the product. The hemostatic membrane prepared by the invention can quickly absorb interface moisture, so that the interface of the hemostatic membrane is in full contact with a tissue interface, strong adhesion is formed to tissues through covalent bonds and intermolecular forces, mechanical compression is caused to injured blood vessels, and hemostasis is promoted. After the hemostatic membrane absorbs blood or tissue fluid, dynamic bonds can be formed, and a certain self-repairing function is achieved. Therefore,the hemostatic membrane has the effects of rapid and efficient hemostasis, adhesion and self-repairing.