This study discusses the application of BIM technology in the digital transformation of construction engineering cost. In view of the difficulties in cost management

such as complexity

time and space influence

human factors and irregular construction organization design

it emphasizes the importance of improving professional ability

strengthening drawing review and ensuring timely update of design changes. BIM technology provides accurate bill of quantities and cost estimation through three-dimensional parametric modeling

enhances the accuracy and dynamics of cost management

optimizes information flow and collaborative work

and reduces communication errors and repetitive work. BIM technology plays an important role in design deepening

bill of quantities compilation

resource procurement

quality and safety control

schedule management and financial settlement

etc. It can automatically extract drawing information and reduce human error. The proposed solution is based on Guang Lianda software

supplemented by Revit/BIM5D

which realizes seamless data docking and real-time update

and improves the efficiency and accuracy of project management. The maturity and application of BIM technology indicates a more efficient and economical future for the construction industry.