A hydrosol preparation system includes a conveyance unit, a distillation unit, a sterilization unit, and a filling unit. The conveyance unit is for conveying a container. The distillation unit performs distillation on a raw material to produce a crude hydrosol. The sterilization unit performs sterilization on the crude hydrosol to produce a final hydrosol. The filling unit fills the final hydrosol into the container. The preparation system integrates all procedures required by manufacturing of the hydrosol product so as to eliminate the need of transferring the semifinished hydrosol product among different production sites, thereby minimizing the risk of inclusion of impurities and maximizing safety and storability of the finished hydrosol product.