The invention provides a rule dynamic issuing method for a software-defined network. The method comprises the steps that S1, multiple rule subsets RS are established for a rule universal set R, rules in each rule subset RS are made to meet a complete hierarchy nesting relation, and a complete hierarchy nesting tree is generated for each rule subset RS; S2, corresponding issuing rules are established according to the complete hierarchy nesting trees generated by all the rule subsets and uploaded network packages; S3, geometric space intersection operations are carried out on the established issuing rules to obtain a final single issuing rule, and then rule issuing operations are carried out. According to the rule dynamic issuing method for the software-defined network, on the premise that the decision consistency of a control plane and a data plane can be guaranteed, the flow effective covering range of the issuing rules is increased greatly, memory usage of equipment is saved remarkably, and the occurrence rate of rule loss is reduced.