The invention relates to a method for the surface treatment of a biologically inert titanium implant to be placed in contact with a bone of the human body, which involves allowing body fluids, such as the inorganic portion of human blood plasma, to naturally deposit, onto the titanium implant, a calcium phosphate film having the formula Ca5(PO4)3(OH), in the form of hydroxyapatite, with a view to rendering the biologically inert titanium biologically active so as to enable the bone to chemically bond to the implant, thus promoting osseointegration, the method including an operation that involves submerging the titanium in a sodium hydroxide (NaOH) solution, wherein said submersion causes the formation of a film of hydrated titanium oxides (HTiO3—) on the titanium, which in turn causes hydroxyl groups (TiOH) to appear, thus enabling the deposition of said calcium phosphate film. The method according to the invention is characterized in that it includes, after the operation of submerging the implant in sodium hydroxide, an operation of anodizing the implant at a given voltage, thereby enabling the stabilization of the oxide film formed by means the operation of submerging the implant in the sodium hydroxide.