Biomass fuel drying and cement kiln coupling system and method

The invention discloses a biomass fuel drying and cement kiln coupling system and method. The system comprises a grate cooler waste heat recovery system, a kiln barrel waste heat recovery system and a biomass drying system. The grate cooler waste heat recovery system introduces kiln head waste heat flue gas of a cement kiln into the biomass drying system to heat biomass, the kiln barrel waste heat recovery system exchanges heat between a collected heat medium and the kiln head waste heat flue gas obtained after the biomass is dried and cooled, and the kiln head waste heat flue gas obtained after heat exchange dries the biomass again. And the heat medium subjected to heat exchange returns to the kiln barrel waste heat recovery system to be circularly heated. The kiln head waste heat of the cement kiln and heat dissipation of the rotary kiln barrel are introduced into the biomass drying system, the waste heat of the cement kiln is utilized, meanwhile, the biomass is subjected to dewatering drying, the heat valu