The utility model provides millimeter wave/terahertz wave imaging equipment. The device comprises a quasi-optical assembly, a millimeter wave/terahertz wave detector array and a reflecting plate adjusting device, the quasi-optical assembly is suitable for reflecting and converging millimeter waves/terahertz waves spontaneously radiated or reflected back by a detected object to the millimeter wave/terahertz wave detector array, and comprises a reflecting plate suitable for receiving and reflecting wave beams from the detected object. Wherein the millimeter wave/terahertz wave detector array issuitable for receiving wave beams from the quasi-optical assembly; the reflecting plate adjusting device is suitable for adjusting the movement of the reflecting plate; according to the utility model,the reflection plate is arranged in the field of view, so that the reflection track of the reflection plate for reflecting the spontaneous radiation or reflected wave beams of the detected object isenveloped into a quasi-circular or quasi-elliptical shape, sampling dense points are concentrated in the middle of the full field of view instead of the edge of the field of view, and sampling pointsare uniformly distributed and convenient to interpolate in most areas of the field of view.