Equipment for producing bio-coal from crop straws and preparation process of bio-coal

The invention discloses equipment for producing bio-coal from crop straws and a preparation process of the bio-coal. The utility model relates to the technical field of biological coal. The equipmentcomprises a third-floor platform, a low-temperature carbonization furnace, a second-floor platform and a first-floor platform, the top of the low-temperature carbonization furnace is fixedly connectedwith a closed spiral feeding cylinder through a feeding pipe, one side of the top of the low-temperature carbonization furnace is fixedly connected with an airflow pipe, and the bottom of the low-temperature carbonization furnace is fixedly connected with a spiral cooling discharging cylinder. The airflow pipe is arranged; the organic acid in the heat flow is cooled and remained in a wood acid liquid collecting cylinder; the cooled reducing gas enters the combustion chamber to be mixed with natural gas for combustion, and heat energy recovery is realized; by arranging a closed spiral feedingcylinder and a spiral cooli