A method for forming a dual-layer composite material, wherein the dual-layer composite material is a biomedical material, comprising: coating a barrier-film layer-forming material onto a surface of a porous scaffold layer to form a dual-layer intermediate product; and drying the dual-layer intermediate product to form a dual-layer composite material which comprises the porous scaffold layer and a barrier film layer, wherein the porous scaffold layer and the barrier film layer are inseparable from each other, and wherein a method for forming the porous scaffold layer comprises: mixing at least one first biodegradable polymer with a first solvent under a stirring speed of 3500-12000 rpm, at 4-10°C, for 90-180 minutes, to form a slurry, wherein the at least one first biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan, and a combination of collagen, gelatin or chitosan, and hyaluronic acid; placing the slurry into a mold and freezing the slurry; performing a lyophilization procedure on the slurry to remove water molecules and obtain a scaffold body; and performing a vacuum heating procedure on the scaffold body to dehydrate and crosslink the scaffold body to form the porous scaffold layer, and wherein a method for forming the barrier-film layer-forming material comprises: mixing a second biodegradable polymer with a second solvent and then letting it stand to form a gel, wherein the second biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan and hyaluronic acid; and stirring the gel to a homogeneous stage to form the barrier-film layer-forming material. coating a barrier-film layer-forming material onto a surface of a porous scaffold layer to form a dual-layer intermediate product; and drying the dual-layer intermediate product to form a dual-layer composite material which comprises the porous scaffold layer and a barrier film layer, wherein the porous scaffold layer and the barrier film layer are inseparable from each other, and wherein a method for forming the porous scaffold layer comprises: mixing at least one first biodegradable polymer with a first solvent under a stirring speed of 3500-12000 rpm, at 4-10°C, for 90-180 minutes, to form a slurry, wherein the at least one first biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan, and a combination of collagen, gelatin or chitosan, and hyaluronic acid; placing the slurry into a mold and freezing the slurry; performing a lyophilization procedure on the slurry to remove water molecules and obtain a scaffold body; and performing a vacuum heating procedure on the scaffold body to dehydrate and crosslink the scaffold body to form the porous scaffold layer, and wherein a method for forming the barrier-film layer-forming material comprises: mixing a second biodegradable polymer with a second solvent and then letting it stand to form a gel, wherein the second biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan and hyaluronic acid; and stirring the gel to a homogeneous stage to form the barrier-film layer-forming material. mixing at least one first biodegradable polymer with a first solvent under a stirring speed of 3500-12000 rpm, at 4-10°C, for 90-180 minutes, to form a slurry, wherein the at least one first biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan, and a combination of collagen, gelatin or chitosan, and hyaluronic acid; placing the slurry into a mold and freezing the slurry; performing a lyophilization procedure on the slurry to remove water molecules and obtain a scaffold body; and performing a vacuum heating procedure on the scaffold body to dehydrate and crosslink the scaffold body to form the porous scaffold layer, and wherein a method for forming the barrier-film layer-forming material comprises: mixing a second biodegradable polymer with a second solvent and then letting it stand to form a gel, wherein the second biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan and hyaluronic acid; and stirring the gel to a homogeneous stage to form the barrier-film layer-forming material. mixing a second biodegradable polymer with a second solvent and then letting it stand to form a gel, wherein the second biodegradable polymer is selected from a group consisting of collagen, gelatin, chitosan and hyaluronic acid; and stirring the gel to a homogeneous stage to form the barrier-film layer-forming material.