Preparation method of porous implant based on ceramic additive manufacturing

The invention provides a preparation method of a porous implant based on ceramic additive manufacturing. The method comprises the following steps that a ceramic negative-type mold of a porous implant model with a gradient microstructure is prepared by using the additive manufacturing method; the ceramic mold is filled with metal powder through pressing of a press machine, a primary metal porous implant is obtained, and the primary metal porous implant is subjected to vacuum sintering so as to enhance the strength of the implant; a mixture of the implant and the ceramic mold is placed in a solution which can dissolve the ceramic mold, and an independent metal implant is obtained; a metal coating is deposited on the surface of the metal implant by using the chemical vapor deposition method; finally, a metal oxide nanotube structure is formed in the surface of the metal implant by using the anodic oxidation method. By means of the method, the defects that a traditional preparation method of the porous implant is uncontrollable in microstructure, direct laser additive manufacturing is high in difficulty and the equipment requirement is high are overcome, the nanocrystallization of the surface structure can be achieved, and a new approach for preparing the porous implant with macro- and micro-nano structures is explored.