The thin-walled frame structure without a bottom plate of π-shape beam plate for a new prefabricated high-piled wharf faces high temperatures in box rooms and difficult inner mold removal during the prefabrication process.In order to solve these problems, this paper analyzes the prefabrication process of the frame structure without a bottom plate and introduces the split-type hydraulic telescopic automatic demolding process and the electric steam curing process.The results show that the automatic demolding process solves the problem that manual work cannot be carried out due to the high temperature in the inner cavity after concrete pouring of the π-shape beam plate.The electric steam curing process can compress the age required for lifting components, save the amount of formwork, and improve the prefabrication efficiency.