In view of the problems of low visualization degree,serious information island,high maintenance cost and high energy consumption of subsystems of smart buildings,this paper relies on BIM+IOT and digital twin technology to re-search and develop a smart building integrated management platform based on the intelligent building of a company in Hu-nan Province.The platform aims at visualization,intelligence,networking and integration.Through the perception,monitoring,analysis,integration,as well as fine positioning and control of the architectural park,the multi-level visual and all-weather digital twin visual management of the park,buildings,interior and equipment is realized,and the operation and maintenance efficiency,intelligent management and control degree and user experience are improved.