A heating device, comprising: a cylinder body, in which a heating chamber having a pick-and-place opening is defined, and the heating chamber is 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, disposed in the cylinder body and electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal, wherein the radiating antenna comprises: a central part and an edge part, wherein the edge part is disposed on one side of the central part away from a position for placing the object to be processed in the heating chamber and extends parallel to the central part and a connecting part, configured to connect the central part and the edge part, wherein the connecting part extends divergently from a peripheral edge of the central part to an inner peripheral edge of the edge part and wherein the radiating antenna is arched in a direction close to the position for placing the object to be processed in the heating chamber, whereby the distance between the center of the radiating antenna and a receiving pole is reduced and the distance between the peripheral edge of the radiating antenna and the receiving pole is increased, so as to make a distribution of the electromagnetic waves in the heating chamber more uniform, characterised in that the connecting part comprises: a first arc segment, extending from the peripheral edge of the central part to a direction close to the edge part and to be tangent to the central part; a straight-line segment, being tangent to the first arc segment; and a second arc segment, connecting an outer peripheral edge of the straight-line segment and the inner peripheral edge of the edge part and being tangent to the straight-line segment and the edge part. a cylinder body, in which a heating chamber having a pick-and-place opening is defined, and the heating chamber is 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 central part and an edge part, wherein the edge part is disposed on one side of the central part away from a position for placing the object to be processed in the heating chamber and extends parallel to the central part and a connecting part, configured to connect the central part and the edge part, wherein the connecting part extends divergently from a peripheral edge of the central part to an inner peripheral edge of the edge part and wherein the radiating antenna is arched in a direction close to the position for placing the object to be processed in the heating chamber, whereby the distance between the center of the radiating antenna and a receiving pole is reduced and the distance between the peripheral edge of the radiating antenna and the receiving pole is increased, so as to make a distribution of the electromagnetic waves in the heating chamber more uniform, characterised in that the connecting part comprises: a first arc segment, extending from the peripheral edge of the central part to a direction close to the edge part and to be tangent to the central part; a straight-line segment, being tangent to the first arc segment; and a second arc segment, connecting an outer peripheral edge of the straight-line segment and the inner peripheral edge of the edge part and being tangent to the straight-line segment and the edge part. a first arc segment, extending from the peripheral edge of the central part to a direction close to the edge part and to be tangent to the central part; a straight-line segment, being tangent to the first arc segment; and a second arc segment, connecting an outer peripheral edge of the straight-line segment and the inner peripheral edge of the edge part and being tangent to the straight-line segment and the edge part.