The invention relates to a vulcanization method for a small-sized cylindrical acoustic beacon piezoelectric ceramic ring without rib grids inside and belongs to the technical field of ocean engineering. The method is characterized by comprising the steps that an inner thread and a lower end face of the lower portion of an acoustic beacon pressure-resistant shell are used as centering positioning references of the piezoelectric ceramic ring, and a fixing base is installed on the acoustic beacon pressure-resistant shell through a thread; the end face of the right side of the fixing base is usedfor positioning the position of the piezoelectric ceramic ring in the acoustic beacon pressure-resistant shell; an O-shaped ring installed on the fixing base is used for sealing a gap between a plastic spacer and the acoustic beacon pressure-resistant shell. The vulcanization method has the advantages that the effect is good, the method is simple, the structure is compact, few processing parts areneeded, and the ring is convenient to disassemble and assemble and can be repeatedly used. The method is mainly applied to vulcanization of the small-sized cylindrical acoustic beacon piezoelectric ceramic ring without rib grids inside.