A heating device, comprising: a cylinder body, provided with a pick-and-place opening; a door body, disposed at the pick-and-place opening and configured to open and close the pick-and-place opening; an electromagnetic generating system, at least a part of which is disposed in the cylinder body or accessed into the cylinder body, so as to generate electromagnetic waves in the cylinder body to heat an object to be processed; and a temperature sensing device, configured to sense a temperature of the object to be processed, wherein the temperature sensing device comprises: a signal sensing part, configured to sense specific parameters of an incident wave signal and a reflected wave signal in the cylinder body; and characterised by a signal processing part, configured to judge whether the average temperature of the object to be processed is in a specific temperature interval according to the specific parameters, wherein the signal processing part is configured to calculate an electromagnetic wave absorption rate of the object to be processed according to the specific parameters, and to determine that the average temperature of the object to be processed is in the specific temperature interval when the electromagnetic wave absorption rate is less than or equal to a preset absorption threshold, wherein the signal sensing part and the signal processing part are integrated on a circuit board, and the circuit board is configured to be grounded. a cylinder body, provided with a pick-and-place opening; a door body, disposed at the pick-and-place opening and configured to open and close the pick-and-place opening; an electromagnetic generating system, at least a part of which is disposed in the cylinder body or accessed into the cylinder body, so as to generate electromagnetic waves in the cylinder body to heat an object to be processed; and a temperature sensing device, configured to sense a temperature of the object to be processed, wherein the temperature sensing device comprises: a signal sensing part, configured to sense specific parameters of an incident wave signal and a reflected wave signal in the cylinder body; and characterised by a signal processing part, configured to judge whether the average temperature of the object to be processed is in a specific temperature interval according to the specific parameters, wherein the signal processing part is configured to calculate an electromagnetic wave absorption rate of the object to be processed according to the specific parameters, and to determine that the average temperature of the object to be processed is in the specific temperature interval when the electromagnetic wave absorption rate is less than or equal to a preset absorption threshold, wherein the signal sensing part and the signal processing part are integrated on a circuit board, and the circuit board is configured to be grounded. a signal sensing part, configured to sense specific parameters of an incident wave signal and a reflected wave signal in the cylinder body; and characterised by a signal processing part, configured to judge whether the average temperature of the object to be processed is in a specific temperature interval according to the specific parameters, wherein the signal processing part is configured to calculate an electromagnetic wave absorption rate of the object to be processed according to the specific parameters, and to determine that the average temperature of the object to be processed is in the specific temperature interval when the electromagnetic wave absorption rate is less than or equal to a preset absorption threshold, wherein the signal sensing part and the signal processing part are integrated on a circuit board, and the circuit board is configured to be grounded.