Disclosed is a film containing an alginate membrane layer comprising a film carrier that absorbs liquid and at least one alginate membrane, the alginate membrane being formed by cross-linking between an alginate such as sodium or potassium alginate and a salt water solution comprising a divalent metal ion such as calcium ions. Also disclosed is a manufacturing method of a film containing an alginate membrane, the film comprises a liquid-absorbent film carrier and alginate membrane, the alginate membrane is a hydrogel membrane having a network structure formed by cross linking, the hydrogel membrane with a network structure is formed on and infiltrated into the surface of the film carrier so as to make the alginate membrane unseparated from the film carrier, the manufacturing method of the alginate membrane comprises the steps of: providing an alginate solution containing a percentage of sodium alginate or potassium alginate by weight and a salt water solution containing a percentage of divalent metal ions by weight； providing a length of the liquid-absorbent film carrier； performing a first coating by soaking to coat a layer of the alginate solution on a surface of the film carrier； then performing a second coating by spray coating to coat a layer of the salt water solution over the layer of the alginate solution； and forming an alginate membrane that is a hydrogel membrane having a network structure, formed on and infiltrated into the surface of the film carrier by crosslinking the alginate in the alginate solution with the divalent metal ions in the salt water； wherein the percentage of sodium alginate or potassium alginate in the alginate solution by weight ranges from 1 % to 5% by weight； and wherein the percentage of the divalent metal ions by weight ranges from 1 % to 10% by weight.
