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Aiming at the problem of complex and discrete parallel relationships among flexible units in the scheduling process of flexible production lines, a Petri net model applicable to the scheduling study of flexible production lines was proposed, taking the flexible production lines of machine tool holders as an example. Firstly, the composition structure of Petri net was analyzed, and the delay function of flexible unit variation was designed. Then, the production scheduling relationship of each flexible unit in the production line was analyzed, and the modular Petri net model of flexible unit was established. Finally, the scheduling Petri net model of modular flexible unit simplified seat class flexible production line was adopted, and the transfer relationship between multiple systems and flexible units in the production scheduling process was studied, and the Petri net model based on information flow was established. ‘The information transfer relationship between multiple systems and flexible u established. ‘The reachable tree analysis method was adopted to study all possible change sequences, and the reachable tree diagram of Petri net was designed to verify the feasibility of the established Petri net model. ‘The research results show that the flexible production scheduling, the production scheduling process was studied, and the Petri net model based on information flow was ‘model of machine tool seat class based on Petri net was feasible and reasonable, and the dynamic production scheduling of flexible production line can be further carried out on this basis. [ABSTRACT FROM AUTHOR]