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Motion modulation of functional micro‐/nanoparticles is a key challenge for biomedical science and development of optics and electronics. Herein, microrail‐assisted reversible assemblies of nanowires remotely powered by acoustic waves are demonstrated. The microrails embedded into the ultrasound field can make the surrounding acoustic potential nonuniform distribution and cause nanowires to trap into and assemble along the microrails. The width of the microrail can determine the dynamic assembly of nanowires in parallel to or in perpendicular to the direction of the microrail, which is validated by numerical simulations. In addition, trapping and transportation of nanowires on microrails are also achieved by adjusting the microfluidic direction from the microrail. Such microrail‐assisted capabilities of assembling and transporting nanowires provide great potentials in photonic crystals, cell collection, and nanoelectronic fabrication.