As the solid waste of Chinese medicine enterprises,herb residue not only pollutes the environment,but also needs to spend a lot of manpower and material resources to carry out harmless treatment.At the same time,a large amount of low-temperature waste heat generated in the production process of traditional Chinese medicine enterprises has not been fully utilized.Based on the theoretical calculation of the residual heat of flue gas,the recoverable residual heat,the amount of dried residue and the reduction of carbon dioxide emission were obtained.The calculation results showed that 13 440 tons of biomass fuel can be obtained by drying the slag every year,saving the coal value of 6.757 million yuan,and reducing the solid waste treatment cost of 5.472 million yuan.In addition,due to the use of biomass instead of coal,carbon dioxide emissions can be reduced by 14 077 tons per year.The results showed that the utilization of flue gas waste heat to recycle the herb residue has good economic benefits.