Composite filler for high-insulation railway rubber base plate as well as processing equipment, preparation method and application of composite filler

The invention discloses a composite filler for a high-insulation railway rubber base plate as well as processing equipment, a preparation method and an application of the composite filler. The composite filler comprises 50-90% of coal gangue particles and 10-50% of calcined kaolin particles, and the coal gangue particles with the particle size smaller than or equal to 2 [mu]m account for 80%-95%; and the calcined kaolin particles with the particle size of less than or equal to 2 [mu]m account for 75-85%. According to the composite filler for the high-insulation railway rubber base plate, the coal gangue particles and the calcined kaolin particles are compounded to form the composite filler, respective advantages of the coal gangue particles and the calcined kaolin particles are exerted, the synergistic interaction effect is achieved, and the obtained high-insulation railway rubber base plate has the advantages of being excellent in dispersity, high in insulativity, high in reinforcement and the like; and the