Abstract: With the steady progress of urbanization and modernization in China, China pays more and more attention to the development of space, and most of the new residential projects at this stage are high-rise residences, which need to install construction lifts to assist construction during construction. When arranging construction elevators, it is inevitable that they will be placed at the backfill soil position. Installing construction elevators on backfill soil can easily cause uneven foundation settlement, resulting in safety hazards and affecting construction safety, quality, and progress. In response to the various shortcomings of traditional backfill construction elevator foundation reinforcement, through the study of composite foundation construction technology for backfill construction elevators, on the one hand, the advantages of good product quality, fast construction, and strong adaptability of wooden piles can be utilized to widely apply them to various weak foundation reinforcement construction elevator foundation projects; On the other hand, using stone powder cushion layer to replace soft backfill soil has the advantages of high strength and self compaction, effectively preventing uneven settlement of construction elevator foundation and improving foundation safety.