The invention discloses a film-forming gel composition, its application and a wound protecting material. The film-forming gel composition comprises the following ingredients: hydroxy propyl cellulose, an esterifying agent, a cross-linking agent and a solvent, wherein the esterifying agent contains saturated fatty hydroxy carboxylic acid and tannic acid. The chemical general formula of the saturated fatty hydroxy carboxylic acid is CnH2n+2-m-L(OH)m(COOH)L, wherein n, m and L are integers; n is greater than or equal to 1; m is greater than or equal to 1; L is greater than or equal to 1; m+L is 2-5; and n+L is 2-6. The film-forming gel composition can be used to prepare a drug for treating skin or oral mucosal diseases, or can be used as a drug carrier to prepare a drug film-forming gel composition and a wound protecting material. The film-forming gel composition contains no aromatic organic carboxylic acid with pharmacological activity, will not produce pharmaceutical action on human body and also will not cause adverse reactions on human body.