A multispectral imaging device for satellite observation operating in N wavelength bands, respectively centered on a first wavelength (λ 1),..., an n th wavelength (λ N) comprising: - a source emitting a light beam in a set of the N wavelength bands; - a wide-field optic; - a set of N rows of detectors, on board a satellite to carry out successive observation of an area observed during the running of the satellite of rows (L 1, L 2,...L N) perpendicular to the direction of displacement D of said satellite and operating in the N wavelength bands, and making it possible to acquire images of said observed area in different emission bands (B 0, B 1, B 2, B 3); - optical filtering means, characterized in that it also comprises: - a first dispersion element (R 1,R) making it possible to disperse the light beam into an ∑F R beam composed of unitary F RI beams towards the filtering means; - the optical filtering means being spectral filtering means and comprising at least one micro-opto-electronic system (MOEMS) on which the F Ri beams arrive, the micro-opto-electronic system comprising a structure of elementary micro-mirrors (M oi) suspended relative to a substrate and the distance or angle of which with said substrate is electrically controllable, so as to constitute, by bringing together certain elementary micro-mirrors of said substrate, a reflection network capable of carrying out N filtering functions for the N spectral bands, wavelength-tunable and diffracting only certain wavelengths, while others are off, an ∑F R' beam reflected by said micro-opto-electronic system presenting spectral bands partially filtered against the F Ri beams; - control means for said micro-opto-electronic system making it possible to select over time, the spatial filtering function; - a second dispersion element (R 2, R) making it possible to recombine all the filtered beams corresponding to a given emission band (B 0, B 1, B 2, B 3) at the output of the filtering means along a given direction, and send them successively in time towards the area to be observed. - a source emitting a light beam in a set of the N wavelength bands; - a wide-field optic; - a set of N rows of detectors, on board a satellite to carry out successive observation of an area observed during the running of the satellite of rows (L 1, L 2,...L N) perpendicular to the direction of displacement D of said satellite and operating in the N wavelength bands, and making it possible to acquire images of said observed area in different emission bands (B 0, B 1, B 2, B 3); - optical filtering means, - a first dispersion element (R 1,R) making it possible to disperse the light beam into an ∑F R beam composed of unitary F RI beams towards the filtering means; - the optical filtering means being spectral filtering means and comprising at least one micro-opto-electronic system (MOEMS) on which the F Ri beams arrive, the micro-opto-electronic system comprising a structure of elementary micro-mirrors (M oi) suspended relative to a substrate and the distance or angle of which with said substrate is electrically controllable, so as to constitute, by bringing together certain elementary micro-mirrors of said substrate, a reflection network capable of carrying out N filtering functions for the N spectral bands, wavelength-tunable and diffracting only certain wavelengths, while others are off, an ∑F R' beam reflected by said micro-opto-electronic system presenting spectral bands partially filtered against the F Ri beams; - control means for said micro-opto-electronic system making it possible to select over time, the spatial filtering function; - a second dispersion element (R 2, R) making it possible to recombine all the filtered beams corresponding to a given emission band (B 0, B 1, B 2, B 3) at the output of the filtering means along a given direction, and send them successively in time towards the area to be observed.