The invention relates to a gravity energy storage device. The gravity energy storage device comprises a control module, a hanging basket, an elevated side beam, fixed pulleys, movable pulleys, a guidewheel, a winch, a cable, a transmission and an electric generator, wherein the hanging basket is a gravity carrier, the fixed pulleys are connected to the elevated side beam, the movable pulleys areconnected to the hanging basket, one end of the cable is connected to the elevated side beam and is connected to the winch through the guide wheel after pass around all the movable pulleys and the fixed pulleys; the control module controls the energy inputting, storing and outputting of the gravity energy storage device the winch is provided with a brake, the winch is connected with the electric generator through a transmission, the control module controls the electric generator to rotate, the winch is driven to roll up the cable to increase the energy input of the hanging basket, and the control module controls the electric generator to stop rotating to store energy; and the hanging basket descends, and the cable pulls the winch to drive the electric generator to generate electricity forpower output. According to the device, the energy can be stored and utilized, the structure is simple, the manufacturing cost is low, and the application range is wide.