Belonging to the technical field of material preparation, the invention discloses a PMS-PZT piezoelectric ceramic curved surface annular thin-wall piece and a preparation method thereof. The method consists of the eight steps of: powder pre-sintering, ceramic suspension preparation, gel injection molding, formed green body drying and demoulding, formed green body degreasing, formed green body sintering, silver coating, and polarization, and finally can obtain the PMS-PZT piezoelectric ceramic curved surface annular thin-wall piece with uniform and compact structure. The invention provided by the invention solves the problems of difficult preparation of high solid volume content and low viscosity ceramic suspensions, easy generation of cracking, deformation defects and the like during drying and degreasing in preparation of PMS-PZT piezoelectric ceramic curved surface annular thin-wall pieces by gel injection molding, and realizes preparation of the PMS-PZT piezoelectric ceramic curved surface annular thin-wall piece with uniform structure and properties and good comprehensive piezoelectric properties.