Method for preparing HMX by dynamic material ratio technology

The invention relates to a process for preparing HMX, which comprises raw material preparation, nitration and pyrolysis processes, and also relates to dynamic material ratio technology for a HMX preparation process. By a material ratio adjusting method, a practical material ratio is kept relatively stable by adjusting the material ratio when the mass of a raw material changes greatly, so that a production process, product yield and product quality are kept stable. In an intermittent process, the HMX yield is up to 75 percent on the premise of lowering the using amount of acetic anhydride by 30 percent and the consumption of the raw material is far lower than that of the same type of foreign process. When the method is applied to a continuous production line, the HMX yield is up to 65 percent on the premise of lowering the using amount of the acetic anhydride by 25 percent, which surpasses that of domestic and foreign intermittent processes.