A dielectric working fluid centralized management system (10) is equipped with a dielectric working fluid adjustment apparatus (12) for adjusting the fluid quality of a dielectric working fluid (LQ) of a plurality of wire electrical discharge machines (24), a dielectric working fluid delivery and reception control member (14) for controlling delivery and reception of the dielectric working fluid (LQ) between a plurality of dielectric working fluid storage tanks (72) disposed corresponding respectively to the plurality of wire electrical discharge machines (24), and in which the dielectric working fluid (LQ) is stored, and the dielectric working fluid adjustment apparatus (12), and a dielectric working fluid quality controller (16), which receives dielectric working fluid information from the plurality of wire electrical discharge machines (24) and controls the dielectric working fluid delivery and reception control member (14), or both the dielectric working fluid delivery and reception control member (14) and the dielectric working fluid adjustment apparatus (12).