Deep foundation pit support construction technology is an important link in the process of civil foundation construction, which is related to the overall construction quality of the building. In order to make the civil engineering as safe as possible during the construction process and to be able to use it stably after the completion of the project, it is extremely important to study the construction technology of deep foundation pit support. Based on this, this article first explains the basic characteristics of deep foundation pit support technology and its application in civil foundation construction, and secondly explains the construction points of deep foundation pit support technology, and finally discusses the construction technology of civil foundation pit support based on specific cases. application.