The noncollinear acousto-optic tunable filter (AOTF) is a new type of spectral component that is developed according to the abnormal acousto-optic interaction principle. The spectral resolution and sidelobe of diffraction signal are two important indices for evaluating the performance of AOTF. The basic principle of doublefiltering using two AOTFs is described. The experimental results confirm that the double-filtering achieves a 40.4% to 83.2% improvement in the spectral resolution and from 9.5570 dB to 13.2407 dB suppression of the sidelobes. The results of this exploratory study demonstrate that double-filtering using two AOTFs has great potential for application in the field of the acousto-optic filtering.