The invention discloses an HTTP (Hyper Text Transport Protocol)-based lossless multi-system data integration method and relates to the technical field of information operation. The method is characterized by comprising the following steps: observing a service rule of an accessed system; determining a login method for the accessed system; determining extraction points of service data; determining an analysis method for the service data; determining the extraction frequency of the data; localizing the data. The HTTP-based lossless multi-system data integration method is reasonable, convenient to operate, and convenient to manage.