Simple chemical deposition was used to prepare three types of amoxicillin nanostructures. Their morphology and size were characterized by scanning electron microscopy, and their chemical bonds were examined by Fourier transform infrared spectrum. Our results show that amoxicillin nanobelts, nanofibers, nanoparticles, and microparticles can be obtained by changing the pH in solutions of amoxicillin sodium. To some degree the controllable growth of amoxicillin can be realized.