Disclosed is a millimeter wave/terahertz wave imaging device (10). The device comprises a quasi-optical assembly comprising a polygon mirror (1), wherein reflecting plates (1A, 1B, 1C, 1D) are respectively arranged on each side face of the polygon mirror (1), and the polygon mirror can rotate around a rotation axis (o) thereof, such that two reflecting plates in the plurality of reflecting plates (1A, 1B, 1C, 1D) serve as a first reflecting plate and a second reflecting plate in turn to receive and reflect a beam self-radiated or reflected by a detected object (31); a third reflecting plate (3A) and a fourth reflecting plate (3B); and two identical ellipsoidal reflecting mirrors (4A, 4B) symmetrically arranged with respect to the polygon mirror (1), wherein one ellipsoidal reflecting mirror is suitable for reflecting a beam from the first reflecting plate to the third reflecting plate (3A), and the other ellipsoidal reflecting mirror is suitable for reflecting a beam from the second reflecting plate to the fourth reflecting plate (3B). The device also comprises a millimeter wave/terahertz wave detector array (2), suitable for receiving beams reflected by the third reflecting plate (3A) and the fourth reflecting plate (3B). The millimeter wave/terahertz wave imaging device (10) can realize a large field angle and a constant light path aperture, and compared with a transmission type, the device is free of color difference and low in energy loss.
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