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The application relates to the fields of rotary body machining die design and die technology, and discloses a die design method and a die for rapid forming of small composite rotary bodies, the design method comprising defining structural parameters of the die, including fixed parameters and variable parameters; modeling based on the structural parameters, and performing mechanical and thermal collaborative finite element analysis; taking the variable parameters as optimization variables, combining the data obtained through the finite element analysis, and determining optimal variable parameters of the die for rapid forming of small composite rotary bodies. The die is a coaxially nested tile valve structure, comprising a center core column, an inner valve and an outer valve from inside to outside. The application realizes miniaturization and light weight of the die while taking into account mechanical transmission performance and thermal response efficiency, can quickly find an optimal die parameter combination through an efficient parameter optimization strategy, and improves forming efficiency and product quality.