The invention provides a houttuynia cordata volatile oil and saturated aromatic water preparation control method and preparation control system. The steam inlet pressure of primary distillation and re-distillation is controlled; the purpose of controlling the temperature of distillate is achieved by controlling the amount of steam introduced into an interlayer and the amount of condensed water orchilled water; the distillation process is strictly controlled, the quality of the distillate is stable, and inter-batch consistency is good; oil-water separation is carried out on the distillate obtained by primary distillation and re-distillation; particularly, the distillate of primary distillation is guaranteed to be subjected to two-stage oil-water separation, the distillate is thoroughly separated into an oil phase and a water phase, corresponding volatile oil and saturated aromatic water are obtained, the saturated aromatic water can be used for an injection liquid due to no oily substances and good water solubility, no precipitate is generated, and the volatile oil can be used for preparing other preparations.