A double water-seal accumulator used in a perfume dispenser includes a casing defining a vertical guide groove, an adapter defining a vertical guide hole and transverse guide groove, a stop ball supported on a spring member in the vertical guide hole and forced by the spring member to block the passage between the vertical guide hole and the transverse guide groove, a shaft member mounted in the casing and defining therein an angled hole and having a bottom raised portion, and an operating member coupled to the shaft member and operable to rotate the shaft member to a predetermined position where the angled hole is kept in communication with the vertical guide groove and the raised portion is stopped against the stop ball to open the passage between the vertical guide hole and the transverse guide groove.