The invention relates to a compressed air electric energy storage device, belonging to the field of electric energy storage. A motor is connected with an air compressor; the air compressor is connected with an air storage tank through an air delivery pipe; the air storage tank is respectively connected with a pneumatic motor through a control valve; the pneumatic motor is connected with a generator; a polyurethane insulation board is attached to the outer surface of the air storage tank; a solar water heater is connected with a heat exchanger positioned in the air storage tank through a circulating water pump; and a heat exchanger damping baffle is connected with the heat exchanger. The device provided by the invention is low in investment cost, simple in operation technique, simple in maintenance and strong in part interchangeability, reduces the wasted wind power, improves the utilization ratio of wind power equipment, solves the problem of waste of the electric energy in the period of the electricity utilization trough, and has very obvious economic benefits; and when a local fault occurs and needs to be maintained, the normal operation of the overall system can not be influenced.