A dual-layer cool-and-heat-purpose salt-exclusive solar pond is formed by a salt-exclusive solar pond (1) at an upper layer and an energy storing pond (2), which are separately connected to a water source. The salt-exclusive solar pond (1) comprises a pond bottom (1.1) and a pond wall (1.2). A top cover of the energy storing pond (2) is the pond bottom (1.1) of the salt-exclusive solar pond (1). A pond wall and a bottom surface of the energy storing pond (2) are a composite layer (2.1). A heat exchange coil (2.2) is disposed in the energy storing pond (2) and used for implementing heat exchange in the energy storing pond (2). The salt-exclusive solar pond (1) and the energy storing pond (2) are communicated through a valve of the pond bottom (1.1) of the salt-exclusive solar pond (1) in a controllable manner. A cross-season energy-storing cooling and heating system using a dual-layer cool-and-heat-purpose salt-exclusive solar pond comprises: at least two dual-layer cool-and-heat-purpose salt-exclusive solar ponds and a heat pump (5). When at least one dual-layer dual-purpose salt-exclusive solar pond is used for cooling, at least one dual -purpose salt-exclusive solar pond is used for heating, and vice versa. The heat pump (5) has one end connected to a circulation line in which the heat exchange coil (2.2) of each energy storing pond (2) is located and the other end connected to an external user (6). A plurality of water pumps (3.1-3.5) and valves (4.1-4.13) are disposed in a system line and separately used for providing power and working conditions of a control system to a medium in the line.