Abstract: As digital binocular is the combination of digital camera and binocular, the resolution for estimating the imaging quality of digital cameras can also be used to estimate the imaging quality of digital binoculars. However, there are many problems if the international standard of resolution measurement for digital cameras is directly used on digital binoculars. A new method to measure the resolution of digital binocular by a collimator is proposed. Repetitive experiments on a certain set of digital binoculars were carried out based on the theoretical feasibility analysis. Some results were obtained by the auto reading software developed by the authors. The average value of horizontal resolution is 814LW/PH, and the standard deviation is 24LW/PH. It shows that the measurement has good reproducibility and high reliability. It is more objective and precise than traditional manual method.