A heating device, comprising: a cylinder body, provided with a pick-and-place opening and configured to place an object to be processed; a door body, disposed at the pick-and-place opening and configured to open and close the pick-and-place opening; an electromagnetic generating module, configured to generate an electromagnetic wave signal; and a radiating antenna, electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal, wherein the heating device further comprises: a signal processing and measurement and control circuit, electrically connected with the electromagnetic generating module and disposed at a rear lower part in the cylinder body, wherein the signal processing and measurement and control circuit is integrated on a circuit board, the heating device further comprising: a housing, configured to separate an inner space of the cylinder body into a heating chamber and an electrical appliance chamber, wherein the object to be processed and the circuit board are respectively disposeable and disposed in the heating chamber and the electrical appliance chamber, wherein the circuit board is horizontally disposed; and characterised in that a clamping tongue extending upward and inward is respectively formed on two lateral side walls of the housing, and the circuit board is clamped above two clamping tongues, in that the radiating antenna is engaged with the housing and provided with a plurality of engaging holes, in that the housing is correspondingly provided with a plurality of buckles, and in that the plurality of buckles respectively pass through the plurality of engaging holes to be engaged with the radiating antenna. a cylinder body, provided with a pick-and-place opening and configured to place an object to be processed; a door body, disposed at the pick-and-place opening and configured to open and close the pick-and-place opening; an electromagnetic generating module, configured to generate an electromagnetic wave signal; and a radiating antenna, electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal, wherein the heating device further comprises: a signal processing and measurement and control circuit, electrically connected with the electromagnetic generating module and disposed at a rear lower part in the cylinder body, wherein the signal processing and measurement and control circuit is integrated on a circuit board, the heating device further comprising: a housing, configured to separate an inner space of the cylinder body into a heating chamber and an electrical appliance chamber, wherein the object to be processed and the circuit board are respectively disposeable and disposed in the heating chamber and the electrical appliance chamber, wherein the circuit board is horizontally disposed; and characterised in that a clamping tongue extending upward and inward is respectively formed on two lateral side walls of the housing, and the circuit board is clamped above two clamping tongues, in that the radiating antenna is engaged with the housing and provided with a plurality of engaging holes, in that the housing is correspondingly provided with a plurality of buckles, and in that the plurality of buckles respectively pass through the plurality of engaging holes to be engaged with the radiating antenna. a signal processing and measurement and control circuit, electrically connected with the electromagnetic generating module and disposed at a rear lower part in the cylinder body, wherein the signal processing and measurement and control circuit is integrated on a circuit board, the heating device further comprising: a housing, configured to separate an inner space of the cylinder body into a heating chamber and an electrical appliance chamber, wherein the object to be processed and the circuit board are respectively disposeable and disposed in the heating chamber and the electrical appliance chamber, wherein the circuit board is horizontally disposed; and characterised in that a clamping tongue extending upward and inward is respectively formed on two lateral side walls of the housing, and the circuit board is clamped above two clamping tongues, in that the radiating antenna is engaged with the housing and provided with a plurality of engaging holes, in that the housing is correspondingly provided with a plurality of buckles, and in that the plurality of buckles respectively pass through the plurality of engaging holes to be engaged with the radiating antenna. a housing, configured to separate an inner space of the cylinder body into a heating chamber and an electrical appliance chamber, wherein the object to be processed and the circuit board are respectively disposeable and disposed in the heating chamber and the electrical appliance chamber, wherein the circuit board is horizontally disposed; and characterised in that a clamping tongue extending upward and inward is respectively formed on two lateral side walls of the housing, and the circuit board is clamped above two clamping tongues, in that the radiating antenna is engaged with the housing and provided with a plurality of engaging holes, in that the housing is correspondingly provided with a plurality of buckles, and in that the plurality of buckles respectively pass through the plurality of engaging holes to be engaged with the radiating antenna.