The embodiment of the invention provides an SDN (Software Defined Network) measurement data collection method and device and belongs to the technical field of the Internet. The method comprises the steps of obtaining network operation data of a control node and node operation data of each service node; determining a current node type of each service node according to the network operation data and the node operation data of each service node; determining the data collection priority of each service node according to a pre-stored corresponding relationship between node types and data collection priorities and the current node type of each service node; and when a preset first data collection period arrives, if it is detected that an SDN is congested, carrying out network measurement data collection according to the data collection priority of each service node. Through adoption of the method and the device, the network stability can be improved.