The invention provides an ecological central air conditioner. A draught fan coil of an air-conditioned room is connected with a condenser of an outdoor unit through a water circulating pipeline. A circulating water pump is arranged between the water circulating pipeline and the condenser. The condenser is connected with a refrigerating unit of the central air conditioner and a fin coil arranged at the bottom of an energy storage pool through a refrigerant circulating pipeline. The energy storage pool is filled with water. The top of the energy storage pool is provided with a water pool heat preservation cover used for reducing heat exchange between the energy storage pool and the outside world. The side wall of the energy storage pool is provided with a crawling ladder, wherein overhauling personnel can conveniently reach the bottom of the energy storage pool through the crawling ladder. An access door is arranged at the top end of the crawling ladder, and the access door is movably connected with the top end of the crawling ladder. The ecological central air conditioner can store energy and reduce energy consumption; through circulatory energy storage and energy release of the energy storage pool, the work of the refrigerating unit of the central air conditioner is reduced or stopped, in this way, the electricity consumption of the central air conditioner is effectively reduced, and the electric energy is saved; and the coldness of winter is stored to summer, the heat in summer is stored to winter, and therefore the central air conditioner is called the ecological central air conditioner.