The invention discloses a biomass straw crushing and briquetting integrated device. The biomass straw crushing and briquetting integrated device comprises a pair of crushing devices which are used forcrushing raw materials; a fermentation device, the a fermentation device comprises a first shell, a cone-shaped device is arranged in the middle of the inner top surface of the first shell, the conical device wall is provided with evenly-distributed liquid spraying holes, the upper part of the cone-shaped device is provided with a communicated liquid inlet pipe, the liquid inlet pipe penetrates out of the top of the first shell, and a first discharge port of the pair of crushing devices is communicated with the top of the first shell, and are both located on the two sides of the cone-shaped device. The device and the method have the advantages that the production of the straw fuel can be completed integrally.