An embodiment of the present invention provides a packet service flow community structure-based service quality fluctuation propagation control method. The method comprises the steps of according to transmitting paths of packet service flows, acquiring an association relationship of the packet service flows, and establishing an association network of the packet service flows; according to the association network of the packet service flows, dividing the service flows into different communities by using a community detection algorithm, and acquiring a boundary service flow of each community; according to different significance of the community boundary service flows, sequentially maintaining bandwidths of the community boundary service flows unchanged, and isolating fluctuation propagation of service quality among communities; and repeating the previous step till the fluctuation propagation of the service quality among service flow communities is isolated. Through adoption of the method, fluctuation of service quality of the service flow in a large range caused by a sudden packet service is prevented simply and effectively, and the service quality of a packet service-oriented transmission network is more stable.