The invention provides a scheduling method for guaranteeing data stream deadline in a service link environment and belongs to the technical field of computer application. The scheduling method comprises three parts of allocating DRFQ rates, determining a data stream scheduling sequence and selecting transmission paths. The step of allocating the DRFQ rates is responsible for attempting to provide fair service provided for all data streams passing through a single network function device. The step of determining the data stream scheduling sequence is responsible for enabling existing network resources to support valid transmission of more data streams. The step of selecting the transmission paths is responsible for selecting suitable transmission paths for the data streams. A new queue scheduling method does not need to be designed, the queue scheduling method on the existing network function device is employed, and through matching of suitable transmission control and transmission path selection, demands of the data streams for the deadlines can be effectively guaranteed in the service link environment.