Solid heat storage and underwater compressed air integrated energy storage system

The utility model provides a solid heat storage and underwater compressed air integrated energy storage system, which relates to the technical field of energy storage and comprises a compression unit, an underwater air storage container, a heat regenerator, a solid electric heat storage device and an expansion machine. The inlet end of the compression unit is connected with the environment, and the outlet end of the compression unit is connected with the underwater gas storage container; an outlet of the underwater air storage container sequentially passes through the regenerator cold side channel, the solid electric heat storage air channel, the expansion machine and the regenerator hot side channel to be connected to the external environment. High-temperature solid electric heat storage is integrated into underwater compressed air energy storage, the work amount of unit air storage is greatly increased, the requirement for high-pressure air storage is reduced, the underwater compressed air energy storage ca