The invention relates to a preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through the method. The method includes the following steps that step a, a first
sodium citrate solution is added into a first boiled
chloroauric acid solution, boiling is kept under the condition of constant stirring, and therefore a gold
nanoparticle solution of which the particle size ranges from 10 nm to 30 nm is obtained; step b, a
hydroxylamine hydrochloride solution and the gold
nanoparticle solution are added into an acid
gold chloride solution for performing
growth control over the particle size, and large-particle-size gold nanoparticles are obtained in a centrifugal mode; step c, the large-particle-size gold nanoparticles are added into deionized water of which the pH is adjusted through a second
sodium citrate solution,
gold chloride is added under the condition of constant stirring for space limited-range
core shell growth, and the gold nanoparticles can be obtained in a centrifugal mode. On one hand, the
sodium citrate solutions are selected and used for adjusting the pH value of the solution, and on the other hand, the
sodium citrate solutions have the unexpected advantages that the
sodium citrate solutions are good stabilizers for the gold nanoparticles, and the particle size and the evenness of the gold nanoparticles are easily controlled.