The invention provides a waste heat pressurizing type copious cooling liquid-state air energy storage system. The low-grade heat (commonly 53.082 kg/s of conduction oil at the temperature about 122 DEG C, ) in the reheated conduction oil in the copious cooling liquid-state air energy storage system and the low-grade heat (about commonly 23.888 kg/s of dry air at the temperature about 120 DEG C ) carried by exhaust gas generated in the expansion power generating acting process of an expansion unit 7 are utilized for driving a secondary Rankine cycle power generation system to conduct cyclic power generation, and therefore the waste heat in the copious cooling liquid-state air energy storage system can be sufficiently utilized, waste is avoided, and the power generating efficiency is improved.