The work aims to study the effects of nano-composite coating (prepared by adding nano- montmorillonite (MMT) to chitosan (CS) on the preservation of eggs. CS/MMT composite coating solution was prepared by addition of 1%, 5% and 9% MMT into CS solution, respectively. After ultrasonic dispersion, coating was applied on eggs. Then the egg samples of blank control group and coating group were stored at 25 ˚C with the relative humidity of 60%. The physicochemical indexes of eggs, including sensory index, weight loss ratio, yolk index, albumen pH value and Haugh unit were measured regularly. When MMT content was 1%, the nano-composite coating could significantly improve the exterior quality, reduce the weight loss ratio, and effectively maintain the quality of eggs. With comprehensive comparison of all indices, it was found that the quality of eggs with composite coating stored for 7 weeks was almost equivalent to that of the control group stored for 3 weeks. However, when MMT content was excessively high, the barrier property of coating was affected adversely by the aggregation of MMT, which compromised their preservation effects on eggs. CS-based nano-composite coating with 1% MMT is able to extend the shelf life of eggs considerately under ambient conditions. As a safe and biodegradable coating material, it shows great potential to be applied in fresh-keeping of eggs.