In our work, polyvinyl alcohol (PVA) protected silver nanoparticles assemble on aluminum sheets was prepared and employed to detect Fenpropathrin acetone (10^-4-10^-7 mol/L). In the process of the experiment, the near-infrared laser beam (785 nm) was used as the excitation light source. The high-quality near-infrared surface-enhanced Raman scattering (NIR-SERS) spectra of fenpropathrin were obtained in the ranges of 200 to 2000 cm^-1 and the detection limit of fenpropathrin acetone was down to 10^-6 mol/L. To verify the spectral reproducibility of the silver films, the spectra of fenpropathrin acetone with two various concentrations (10⁻⁴ mol/L and 10⁻⁵ mol/L) were detected which on six different nano-silver films. The results show that the nano-silver films have highly spectral reproducibility when detected fenpropathrin acetone.