The invention relates to a flow generation method of a power dispatching exchange network based on multicast communication. The method includes the following steps: capturing a flow data signal through a router; performing zero mean processing on the flow data signal captured through the step 1; using wavelet transformation to perform wavelet decomposition on a zero mean data signal obtained by processing in the step 2 to obtain a high frequency part and a low frequency part of the flow data signal respectively; applying AR model modeling to the low frequency part to obtain a low frequency reconstruction signal; applying BP neural network modeling to the high frequency part to obtain a high frequency reconstruction signal; obtaining a reconstructed flow data signal according to the low frequency reconstruction signal obtained by the step 4 and the high frequency reconstruction signal obtained by the step 5; and correcting the reconstructed flow data signal. By analyzing time frequency characteristics of end-to-end flow, the flow generation method of the power dispatching exchange network based on multicast communication in the invention can more accurately obtain concealing features under different time frequencies. More importantly, a complicated problem is decomposed into a relatively simple and easy problem.