Embodiments of the invention provide a network optimization flow control method, device and system, wherein the method includes the steps that a data source node obtains a sub-data flow transmission path from the data source node to a sever node, and loads a first data flow amount onto the sub-data flow transmission path; a router node aggregates link prices of a plurality of links on the sub-data flow transmission path to obtain link aggregated price and feeds the link aggregated price back to the data source node; and the data source node obtains a second data flow amount according to the link aggregated price and server weight of the server node and loads the second data flow amount instead of the first data flow amount onto the sub-data flow transmission path. Embodiments of the invention greatly reduce calculation amount, and improves instantaneity of network optimization.