The invention discloses a multifunctional separate constant-temperature breeding-planting circulation system, comprising a compressor and a water tank; a condenser and a temperature sensing probe arefixedly mounted on the upper surface of the compressor; an electromagnetic valve is also mounted on the front of the compressor; a drying filter is arranged at the left end of the electromagnetic valve; the right end of the electromagnetic valve is connected with a freezing chamber through a temperature sensor; a refrigerating chamber is fixedly mounted at the upper end of the freezing chamber andserves as a second evaporator connected with the compressor through a temperature sensor; the water tank is arranged on the left of the condenser; the upper surface of the water tank is provided witha tank water inlet and a tank water outlet; the water tank is also provided with a connection that facilitates cleaning and connection with another water tank; a control valve is fixedly mounted at the upper end of the tank water inlet through a water pipe. The multifunctional separate constant-temperature breeding-planting circulation system allows resources to be recycled, can effectively saveenergy and is highly practical.