The invention belongs to the field of gradient ceramic materials, and discloses a method for preparing gradient ceramics by electric field-assisted high-valence counter ion controlled release curing.The method comprises the following steps of (a) mixing ceramic powder, a dispersant and deionized water, and then sequentially adding a curing agent and an ester pH regulator for uniform mixing to obtain ceramic slurry; and (b) injecting the ceramic slurry into a mold, then placing the mold in a direct-current electrostatic field, heating the ceramic slurry, and carrying out heat preservation, wherein the pH regulator hydrolyzes to release a weak acid to react with the curing agent to release high-valence metal cations; the metal cations are distributed in a gradient concentration mode in theceramic slurry under action of an electrostatic field; the ceramic slurry is solidified to form a wet ceramic blank; and the wet ceramic blank is dried and sintered to obtain a desired gradient ceramic sintered body. According to the invention, the method has the advantages that gradient ceramics having adjustable composition gradient and continuous and uniform composition transition is formed; operation is simple; and the method is suitable for any negatively-charged ceramic slurry.