NOVELTY - Direct methanol fuel battery comprises a proton exchange film, a pair of gas diffusion layers, many encapsulation layers and many adhesive materials. The proton exchange film includes a first surface and an opposite second surface and is clamped between a pair of electrodes, where the partial first and second surfaces on the two tail ends and the adjacent tail ends of the proton exchange film are exposed from the electrode. The pair of gas diffusion layers is located on the electrode. Encapsulation layers are physically embedded to the exposed first and second surfaces.    USE - Used as a direct methanol fuel battery.    ADVANTAGE - The direct methanol fuel battery: can greatly simplify process; and avoids reliability reduction due to inaccurate assembly position.    DETAILED DESCRIPTION - Direct methanol fuel battery comprises a proton exchange film, a pair of gas diffusion layers, many encapsulation layers and many adhesive materials. The proton exchange film includes a first surface and an opposite second surface and is clamped between a pair of electrodes, where the partial first and second surfaces on the two tail ends and the adjacent tail ends of the proton exchange film are exposed from the electrode. The pair of gas diffusion layers is located on the electrode. Encapsulation layers are physically embedded to the exposed first and second surfaces, where the encapsulation layer has many holes. The adhesive materials are fixed on the encapsulation layer, pass through the hole of the encapsulation layer and contact the first and second surfaces of the proton exchange film. An INDEPENDENT CLAIM is also included for forming the direct methanol fuel battery, comprising: either (A) providing a film electrode group including a pair of electrodes and the proton exchange film clamped between the pair of electrodes, performing a first fixing step of fixing the pair of gas diffusion layers on the electrode, and performing a second fixing step of physically embedding the encapsulation layers to the exposed first and second surfaces; or (B) providing a film electrode group including a pair of electrodes and the proton exchange film clamped between the pair of electrodes, performing a first fixing step of physically embedding the encapsulation layers to the exposed first and second surfaces.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the direct methanol fuel battery.