A thermostatic valve comprising a valve body, a first elastic member, a second elastic member, a valve seat assembly, a valve core, and a thermal actuator, wherein the valve seat assembly comprises a valve seat; the valve body comprises a first valve body and a second valve body; the first elastic member, the second elastic member, the valve seat assembly, the valve core, and the thermal actuator are arranged in the valve body; and the valve seat assembly is fixed or limited relative to the valve body; wherein the thermostatic valve comprises six ports, the six ports comprise a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port; the thermostatic valve comprises four valve port portions each having a valve port, the four valve port portions comprise a first valve port portion having a first valve port, a second valve port portion having a second valve port, a third valve port portion having a third valve port, and a fourth valve port portion having a fourth valve port; the first valve port portion is arranged in the valve body, and the fourth valve port portion is arranged in the valve body; and the thermostatic valve comprises a first cavity and a second cavity, the first cavity is isolated from the second cavity, the first valve port portion is arranged in the second cavity, the fourth valve port portion is arranged in the first cavity, the first elastic member is arranged in the second cavity, the second elastic member is arranged in the first cavity, a part of the thermal actuator is arranged in the first cavity, and another part of the thermal actuator is arranged in the second cavity; one end of the thermal actuator abuts against the first elastic member, and another end of the thermal actuator abuts against the second elastic member; and one of the third port, the fourth port and the sixth port is in communication with the second cavity, to serve as an inlet of a first fluid, and the other two of the third port, the fourth port and the sixth port are configured to be in communication with the second cavity through the first valve port and the second valve port respectively, to serve as outlets of the first fluid; and one of the first port, the second port and the fifth port is in communication with the first cavity, to serve as an inlet of a second fluid, and the other two of the first port, the second port and the fifth port are configured to be in communication with the first cavity through the third valve port and the fourth valve port respectively, to serve as outlets of the second fluid. the thermostatic valve comprises six ports, the six ports comprise a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port; the thermostatic valve comprises four valve port portions each having a valve port, the four valve port portions comprise a first valve port portion having a first valve port, a second valve port portion having a second valve port, a third valve port portion having a third valve port, and a fourth valve port portion having a fourth valve port; the first valve port portion is arranged in the valve body, and the fourth valve port portion is arranged in the valve body; and the thermostatic valve comprises a first cavity and a second cavity, the first cavity is isolated from the second cavity, the first valve port portion is arranged in the second cavity, the fourth valve port portion is arranged in the first cavity, the first elastic member is arranged in the second cavity, the second elastic member is arranged in the first cavity, a part of the thermal actuator is arranged in the first cavity, and another part of the thermal actuator is arranged in the second cavity; one end of the thermal actuator abuts against the first elastic member, and another end of the thermal actuator abuts against the second elastic member; and one of the third port, the fourth port and the sixth port is in communication with the second cavity, to serve as an inlet of a first fluid, and the other two of the third port, the fourth port and the sixth port are configured to be in communication with the second cavity through the first valve port and the second valve port respectively, to serve as outlets of the first fluid; and one of the first port, the second port and the fifth port is in communication with the first cavity, to serve as an inlet of a second fluid, and the other two of the first port, the second port and the fifth port are configured to be in communication with the first cavity through the third valve port and the fourth valve port respectively, to serve as outlets of the second fluid.