Multi-stage water tank heat storage system

The utility model discloses a multi-stage water tank heat storage system which comprises a cold water tank and a hot water tank. An air energy heat pump main machine water supply pipe and a heat exchange terminal water return pipe are connected to the outer portion of the cold water tank in a penetrating mode. And the hot water tank is externally connected with a heat exchange terminal water supply pipe and an air energy heat pump main machine water return pipe in a penetrating manner. The two water tanks are adopted, cold water and hot water are arranged in an isolated mode, and the hot water supply stability of the heat exchange terminal is optimized. 本实用新型公开了一种多级水箱储热系统，包括冷水箱以及热水箱。所述的冷水箱外部贯通连接有空气能热泵主机供水管以及换热终端回水管。所述的热水箱外部贯通连接有换热终端供水管以及空气能热泵主机回水管。本实用新型采用两个水箱，使冷热水隔离布置，优化对换热终端的热水供应稳定性。