Abstract: Energy storage technology is the key technology of storing and releasing electric energy through certain medium or device. The technology can achieve controllable and stable output of renewable energy, which meets the requirements of large-scale utilization of renewable energy. In this paper, the development status, technical characteristics and application fields of energy storage technology were briefly introduced, and the factors that restrict the development of energy storage technology were discussed. The situation of wind power consumption in Liaoning power grid was analyzed in this paper, and the effect of improving power quality and peak shaving when the energy storage system applied on wind power station was analyzed in depth, which may provide theoretical guidance on the promotion and application of energy storage technology in the field of renewable energy.