The invention belongs to the field of biological bone implantation and restoration, and discloses a method for preparing a titanium alloy implant by adopting a minimal curved surface porous structure.The method comprises the steps that (a) parameters such as contour, porosity and young modulus required for the implant to be formed are determined, and a solid model of the minimal curved surface porous structure is established to meet the requirements of the implant to be formed; (b) the solid model is adjusted according to the contour required by the implant to be formed so as to be the same as the outline required for the implant to be formed, and a three-dimensional model of the porous structure which meets the required contour of the implant is obtained; (c) a three-dimensional solid model is formed by using a selective laser melting technique to obtain the required implant to be formed. According to the method for preparing the titanium alloy implant by adopting the minimal curvedsurface porous structure, the defects that a traditional titanium alloy lattice structure node is prone to fatiguing and is difficult to form are overcome, and novel porous materials suitable for repairing biological bones are manufactured.