Aiming at the low efficiency of energy storage devices of wind energy and solar power generating system under the condition of breeze and weak light, a model of stepwise super capacitor to storage energy rapidly is proposed, and a stepwise hybrid energy storage system which takes lithium battery and super capacitor as the basic energy storage components is designed. Based on the feature of super capacitor charge and discharge, an energy storage device is designed by setting multiple super capacitor in series connection. Using the feature of high energy density of lithium battery, this paper designs and implements a device combining stepwise fast storage system with lithium battery. This system realize the functions such as charging, controlling, protection, displaying and so on. The test verifies that the system can solve energy storage problem in low voltage operation under the condition of breeze and weak light and enhance the effectiveness of micro power source of utilization.