The invention discloses a control method for gold atom deposition on a silver nanostructure. The control method for gold atom deposition on the silver nanostructure comprises the following steps of S1, taking a gold nano bipyramid as a core, epitaxially growing silver to prepare a silver nanorod, and distributing a high surface energy surface and a tip position in an ectopic mode; S2, dispersing the silver nanorod serving as a reaction template into a hexadecyl trimethyl ammonium bromide solution, adding an ascorbic acid solution, and uniformly stirring; S3, adjusting the pH value of the mixed solution so as to adjust the reducibility of the ascorbic acid solution and to achieve the adjustment of the ratio between the replacement reaction and the co-reduction reaction in a reaction system; and S4, dropwise adding a gold precursor solution into the obtained reaction system, wherein the reaction system is converted into a co-reduction reaction system from a replacement reaction system, and the deposition position of reduced gold atoms is gradually migrated to the tip of the silver nanorod from the high surface energy face. According to the control method for gold atom deposition on the silver nanostructure, controllable deposition of the gold atoms can be achieved by adjusting the pH value of the reaction system, the conditions are simple and mild, and operability is high.