Embodiments of the present invention provide a data stream scheduling method, device, and system, and relate to data processing technologies, so as to reduce a delay in a data stream scheduling process and relieve a congestion problem of a forwarding link during forwarding of a data stream, where the method includes: receiving, by a data stream scheduling entity in a network, a data packet that is currently transmitted and obtaining data stream information of a data stream where the data packet is located; determining a type of the data stream according to the data stream information; and when the data stream is a specific data stream, applying to a centralized control device in the network for an optimized forwarding policy, so as to forward the data stream, or when the data stream is a common data stream, forwarding the data stream according to a default forwarding policy.