SDN (Software Defined Network) data stream transmission control method and device

The invention discloses an SDN (Software Defined Network) data stream transmission control method and device, and the method comprises the steps: determining currently transmitted data streams in an SDN, and obtaining a data stream set; determining a plurality of target large streams in the data stream set according to a preset screening condition to obtain a target large stream set; according to a preset optimization algorithm, a target transmission link of each target large flow in the target large flow set is determined, and the preset optimization algorithm is used for adjusting a position vector and a speed vector of each target large flow in the target large flow set; the total throughput of the target large flow subset corresponding to each target large flow is not greater than the available bandwidth corresponding to the target large flow subset, and the available bandwidth corresponding to the target large flow subset is the available bandwidth of the corresponding target transmission link; wherein t