The invention relates to a membrane electrode integrated component with sealed frames and a preparation method thereof. The membrane electrode integrated component comprises an electrolyte film, electrodes which are arranged at the two sides of the electrolyte film and respectively comprise a catalytic layer and a diffusion layer, and the elastomer sealed frames arranged around the electrodes at the two sides of the electrolyte film; wherein the elastomer sealed frames are higher than the diffusion layers (3) by 0.1-2.0mm; the two ends of the sealed frame are designed with convex sealing linesused for sealing the sealed frame and a bipolar plate; the sizes of the catalytic layers and the diffusion layers at the two sides of the electrolyte film meet the requirement of D2<= D1<=D2+D3, wherein the D1 is the length, by which every side of the electrolyte film is longer than the catalytic layer and the diffusion layer; the D2 is the sum of the thicknesses of the catalytic layer and the diffusion layer; and the D3 is the thickness, by which the elastomer sealed frames are higher than the catalytic layers and the diffusion layers at the two sides of the electrolyte film. The invention has the characteristics that the insulation property and the gas barrier property of the cell can be ensured, the membrane electrode integrated component is easy for batch production and is beneficialto simplifying the assembly and the disassembly of a battery pack, and the production efficiency can be improved.