A millimeter-wave inspection apparatus, wherein the millimeter-wave inspection apparatus comprises: optics devices (30, 40, 50), configured to receive millimeter-wave energy radiated from an object to be inspected and focus the received millimeter-wave energy; a radiometer receiving device configured to receive the focused millimeter-wave energy and transform the millimeter-wave energy into electrical signal; and an imaging device configured to generate a temperature image of the object to be inspected in accordance with the electrical signal, wherein the millimeter-wave inspection apparatus further comprises a radiometer temperature calibration device, which comprises: a normal temperature calibration mechanism, having a calibration temperature equal to the current environment temperature, to calibrate the initial value of the radiometer; and a high temperature calibration mechanism, having a calibration temperature higher than the current environment temperature, to cooperate with the normal temperature calibration mechanism for calibrating the gain of the radiometer, characterized in that the normal temperature calibration mechanism comprises a rotatable normal temperature calibration hollow cylinder assembly and a first driving motor mounted onto a bracket, to drive the normal temperature calibration hollow cylinder assembly to continually rotate around the radiometer, and the high temperature calibration mechanism comprises a high temperature calibration semi-circular plate assembly and a second driving motor mounted on the bracket to drive the high temperature calibration semi-circular plate assembly to continually swing around the radiometer. optics devices (30, 40, 50), configured to receive millimeter-wave energy radiated from an object to be inspected and focus the received millimeter-wave energy; a radiometer receiving device configured to receive the focused millimeter-wave energy and transform the millimeter-wave energy into electrical signal; and an imaging device configured to generate a temperature image of the object to be inspected in accordance with the electrical signal, wherein the millimeter-wave inspection apparatus further comprises a radiometer temperature calibration device, which comprises: a normal temperature calibration mechanism, having a calibration temperature equal to the current environment temperature, to calibrate the initial value of the radiometer; and a high temperature calibration mechanism, having a calibration temperature higher than the current environment temperature, to cooperate with the normal temperature calibration mechanism for calibrating the gain of the radiometer, characterized in that the normal temperature calibration mechanism comprises a rotatable normal temperature calibration hollow cylinder assembly and a first driving motor mounted onto a bracket, to drive the normal temperature calibration hollow cylinder assembly to continually rotate around the radiometer, and the high temperature calibration mechanism comprises a high temperature calibration semi-circular plate assembly and a second driving motor mounted on the bracket to drive the high temperature calibration semi-circular plate assembly to continually swing around the radiometer. a normal temperature calibration mechanism, having a calibration temperature equal to the current environment temperature, to calibrate the initial value of the radiometer; and a high temperature calibration mechanism, having a calibration temperature higher than the current environment temperature, to cooperate with the normal temperature calibration mechanism for calibrating the gain of the radiometer, characterized in that the normal temperature calibration mechanism comprises a rotatable normal temperature calibration hollow cylinder assembly and a first driving motor mounted onto a bracket, to drive the normal temperature calibration hollow cylinder assembly to continually rotate around the radiometer, and the high temperature calibration mechanism comprises a high temperature calibration semi-circular plate assembly and a second driving motor mounted on the bracket to drive the high temperature calibration semi-circular plate assembly to continually swing around the radiometer.