The invention provides an M-Z shortwave infrared imaging spectrometer which can realize high-resolution and wide-field spectrum detection in a shortwave infrared spectrum band. The M-Z shortwave infrared imaging spectrometer comprises an objective lens imaging system and an M-Z interferometer set in a converging light path at the rear end of the objective lens imaging system. The objective lens imaging system is an off-axis three-mirror system which adopts positive-negative-positive focal power distribution and has no intermediate image plane. The M-Z interferometer is mainly composed of two cubic beam splitter prisms and two 90-degree pentagonal reflection prisms with an angle of deflection. After an imaging beam from an objective lens enters the first cubic beam splitter prism, the beam is divided into two beams which respectively enter the upper and lower 90-degree pentagonal reflection prisms. The two 90-degree pentagonal reflection prisms refract the beams 90 degrees. The beams enter the second cubic beam splitter prism and merge. Finally, an interferogram modulated target scenery image is formed at the image plane.