A medicinal liquid preparation assist system according to the present invention includes a medicine bottle weight measurement unit having a first weight measurement portion for measuring the total weight of medicine bottles placed on a medicine bottle mounting portion an infusion bag weight measurement unit having a second weight measurement portion for measuring the weight of an infusion bag placed on an infusion bag mounting portion a storage unit a control unit for producing auditing information based on changes in weight measured by the medicine bottle weight measurement unit and the infusion bag weight measurement unit, and storing the produced auditing information in the storage unit and an information presentation unit for displaying at least one of information about medicinal liquids to be injected into the infusion bag, the information being stored beforehand in the storage unit, and the auditing information stored in the storage unit by the control unit.
