In this paper, the application of digital technology in basic engineering is carried out in the second phase of the comprehensive service building project of Quanzhou Digital Economy Industrial Park. From the key and difficult points of construction technology, to the extraction of key construction technology principles, to the implementation and evaluation of specific projects, a set of new construction methods based on digital technology for foundation engineering earthwork excavation and cushion construction are summarized. The proposed method solves many difficulties, such as the difficulty of understanding the drawings, the difficulty of explaining the scheme, the difficulty of setting out on site and the difficulty of cost control. The research method achieves the purpose of reducing the cost and increasing the efficiency of the project. Compared with the traditional construction method, it has obvious advantages.