The invention discloses a method of using the partition board diffusivity to control direct methyl alcohol fuelcell methyl alcohol solution concentration which belongs to the clean energy domain and its equipment. The method is that between the pure methyl alcohol vessel and the methyl alcohol solution vessel uses the partition board to connect; adjusts the piston altitude of pure methyl alcohol vessel, to control the methyl alcohol member speed in the methyl alcohol vessel to proliferate from the partition board to the methyl alcohol solution vessel in order to adjust the methyl alcohol solution density; causes maintain the prearrange density value of the needed methyl alcohol solution when the voltaic pile normal work; feeding to the battery voltaic pile use. The above two kind of equipments overall structure is same elementary, the one is using the linear relation of the spring material volume and the methyl alcohol solution, through the leverage adjusts the methyl alcohol piston altitude to control the proliferation quantity; the another is that by the controller control the electrical machinery, adjusts the methyl alcohol piston altitude to control the proliferation quantity. The invention has the merit of slight volume, simple structure, the methyl alcohol solution concentration control nimble, simultaneously also when work needlessly consumes the energy.