Straw has the properties of fertilizer, energy, and feed, and the effect of direct return to the field is not to be ignored. The phenomenon of straw burning is widespread, waste of resources is serious and environmental pollution is aggravated. Straw carbonization technology can effectively reduce greenhouse gas emissions caused by straw burning and improve the utilization rate of straw. According to different processing capacity, straw carbonization machine is divided into fixed internal heating type carbonization and rotary retort carbonization.