The invention relates to a technological process for producing a new biomass energy source capable of replacing fossil fuel through the raw material of crop straw and a device thereof, in particular to a biomass compact solidification forming process and a special device thereof. The technological process comprises the following steps: high-speed grinding and crushing I, weighing and metering II, mixing and stirring III, spiral hot-press forming IV and automatic packaging V. A Biomass compact block produced through the method and the special device can be widely applied to the industries consuming a large amount of energy and resources such as heat supply, brick making, cement, power generation, and the like.