The design of low-light lens with diffractive optical element (DOE) can reduce the volume and weight of lens. DOE can correct aberrations well in virtue of its negative diffusion performance that is different from traditional lenses. The diffraction efficiency of a single-layer DOE can reach 100% only at a specific wavelength, and obviously decreases with the change of wavelength. The double-layer DOE has higher diffraction efficiency at any wavelength in the entire working band. A low-light night-vision objective lens system with double-layer DOEs is designed based on the excellent performance of double-layer DOEs. The diffraction efficiency of the double-layer DOE is higher than 98% in the working band from 0.65 μm to 0.9 μm. The length of the system is 60 mm, the field of view is 40°, the F number is 1.2, and the focal length is 25 mm. The simulation result shows that the system has fine imaging quality, and the modulation transfer function value is greater than 0.5 at the spatial frequency of 40 lp/mm.