The invention provides a spatial network routing method based on load awareness flow dynamic adaptation, and aims to ensure efficient and reliable transmission of data and stable running of a spatial network. The method comprises a dynamic access process of an access node and a load awareness process of a backbone node. Dynamic access control of a lightweight access node is realized by an access user identity authentication mechanism, and an overlapping region is covered with the backbone node. During data transmission in a current region, network access of a next region and continuous switching of data transmission are finished, so that jittering in a data transmission process is avoided. A node load and flow awareness mechanism is used, and a backbone node comprehensive flow processing capability value is obtained through fusion calculation and transmitted to the access node. The access node adaptively and dynamically adjusts a data transmission rate according to the value, so that efficient and reliable transmission of data and stable running of the spatial network are ensured.