The present invention provides a design method and system for a power component scheme of a high-speed train. The system comprises: a traction subsystem parameter setting unit, a traction subsystem design unit, a high-pressure subsystem parameter setting unit, a high-pressure subsystem design unit, a brake subsystem parameter setting unit and a brake subsystem design unit. The system provided by the present invention normalizes and modularizes the whole design process, and the user only needs to complete corresponding parameter assignment according to an interface parameter instruction, so that the user participation part is simplified, and design efficiency and quality can be improved.