The invention discloses a time delay generation method based on a generative model and belongs to the technical field of network delay predication. The time delay generation method based on the generative model comprises the steps of generating a word sequence according to a historical time delay data set and preset time delay accuracy, dividing the word sequence into documents which are mutually disjoint to obtain a document collection, training the document collection according to a generative model training algorithm to obtain time delay generation model parameters, and generating a random period of predicted time delay according to the time delay generation model parameters. According to the time delay generation method based on the generative model, laws existing among historical time delay data are found out, time delay data which are similar to the historical time delay data set are generated in a simulating mode, and therefore the accuracy of the predicted time delay is improved.