A thermostatic valve, comprising: a first valve body, a second valve body, a third valve body, a first thermal actuator, a second thermal actuator, a valve core, a first valve port, a second valve port and a third valve port; wherein the first valve body comprises a second cavity and a third cavity, the second thermal actuator is sealedly fixed in the first valve body to isolate the second cavity from the third cavity; at least a part of the valve core is located in the second cavity, and the valve core is connected to, or is integrated with, or abuts against a second valve stem of the second thermal actuator; the second thermal actuator is configured to act in response to a change in temperature of a fluid in the third cavity, and the valve core is configured to open the second valve port or the third valve port in response to an action of the second valve stem; characterized in that: one end of the second valve body is fixed to the first valve body, and another end of the second valve body is fixed to the third valve body; the third valve body comprises a first cavity, the second valve body comprises a flow passage, and the flow passage is capable of communicating with the first cavity through the first valve port and capable of communicating with the second cavity through the second valve port; and at least a part of the first thermal actuator is accommodated in the first cavity of the third valve body, and the first thermal actuator is configured to act in response to a change in temperature of a fluid in the first cavity to open or close the first valve port or to adjust an opening degree of the first valve port. a first valve body, a second valve body, a third valve body, a first thermal actuator, a second thermal actuator, a valve core, a first valve port, a second valve port and a third valve port; wherein the first valve body comprises a second cavity and a third cavity, the second thermal actuator is sealedly fixed in the first valve body to isolate the second cavity from the third cavity; at least a part of the valve core is located in the second cavity, and the valve core is connected to, or is integrated with, or abuts against a second valve stem of the second thermal actuator; the second thermal actuator is configured to act in response to a change in temperature of a fluid in the third cavity, and the valve core is configured to open the second valve port or the third valve port in response to an action of the second valve stem; characterized in that: one end of the second valve body is fixed to the first valve body, and another end of the second valve body is fixed to the third valve body; the third valve body comprises a first cavity, the second valve body comprises a flow passage, and the flow passage is capable of communicating with the first cavity through the first valve port and capable of communicating with the second cavity through the second valve port; and at least a part of the first thermal actuator is accommodated in the first cavity of the third valve body, and the first thermal actuator is configured to act in response to a change in temperature of a fluid in the first cavity to open or close the first valve port or to adjust an opening degree of the first valve port. one end of the second valve body is fixed to the first valve body, and another end of the second valve body is fixed to the third valve body; the third valve body comprises a first cavity, the second valve body comprises a flow passage, and the flow passage is capable of communicating with the first cavity through the first valve port and capable of communicating with the second cavity through the second valve port; and at least a part of the first thermal actuator is accommodated in the first cavity of the third valve body, and the first thermal actuator is configured to act in response to a change in temperature of a fluid in the first cavity to open or close the first valve port or to adjust an opening degree of the first valve port.