In order to fully improve the quality of existing high-rise office building renovation, the article analyzes the renovation project of Shenzhen Stock Exchange, discusses the renovation design of building ecological functions, smart systems, and building materials under ecology and digitization, and explores in detail the BIM technology, intelligent system and energy-saving material application technology used in the actual renovation process of buildings. It continuously enhances the quality of renovation of existing buildings, and provides several reference points for relevant personnel.