The invention discloses a high-speed railway pantograph-net-train-rail vertical coupling large system dynamic modeling and simulation method. Independent dynamic models of a contact net system, a pantograph-train system and a rail system and contact models among the contact net system, the pantograph-train system and the rail system are built. The invention also discloses a coupling integration algorithm to achieve coupling dynamic simulation calculation of a high-speed railway pantograph-net-train-rail large system. Compared with traditional methods, two-way interaction influence rules between a pantograph system and the train rail system can be taken into consideration, simulation calculation better meets practical requirements, and precision and safety of subsequent engineering design can be improved.