The invention relates to an integrated simulation platform and method for an electromagnetic rail gun. The integrated simulation platform and method for the electromagnetic rail gun aim at solving the problems that in the prior art, whole trajectory simulation, model verification, simulation optimization, simulation test design and firing accuracy analysis and assessment cannot be performed on the electromagnetic rail gun. According to the technical scheme, the integrated simulation platform for the electromagnetic rail gun comprises an electromagnetic rail gun simulation subsystem, a model verification subsystem, a simulation optimization subsystem, a test design subsystem and a firing accuracy analysis and assessment subsystem; the electromagnetic rail gun simulation subsystem comprises a bullet module, a rail module, a pulse power supply module, an armature module, an object module, a parameter configuration module, a simulation process management module and a data recording module. The integrated simulation platform and method for the electromagnetic rail gun are applied to the technical field of computer simulation.