The invention discloses a titanium surface micro-nano zinc phosphate strontium chemical conversion film and controllable preparation method thereof. The method comprises the following steps of the chemical conversion solution is prepared, wherein the chemical conversion solution contains strontium ions, zinc ions, dihydrogen phosphate ions and an accelerant; carrying out iron powder curing treatment on the chemical conversion solution to obtain a curing solution; and coupling the cleaned and surface-activated titanium matrix with a pure iron clamp, and then soaking the titanium matrix and thepure iron clamp in a curing solution for chemical conversion treatment to obtain the chemical conversion film. The controllable preparation method of different micro-nano structures of the zinc-strontium-phosphate film layer is realized through the addition amount of the zinc-containing compound in the conversion solution and the regulation of the accelerator, the introduction of the biological functional element and the micro-nano structure regulation and control are combined, so that the early bone integration capability and the antibacterial property of the titanium-based implant are further improved, and the clinical application effect of the titanium-based implant is improved.