The invention discloses a wide band, high resolution and spectral imaging information simultaneous acquisition device. The device specifically comprises an incident slit, a collimating mirror, plane mirrors arranged in a layered mode, a diffraction grating, an imaging mirror and an area array photoelectric detector. According to the working state, radiation energy passing through the incident slitof a spectrograph is collimated by the collimating mirror, reflected by the plane mirrors and split by the diffraction grating sequentially, and finally dispersion spectra corresponding to all layersand with different band ranges are simultaneously focused and imaged on the photoelectric detector through the imaging mirror. Through the device, simultaneous acquisition of a wide spectral band range, a high spectral resolution and imaging information can be realized; and spectral imaging detection is performed on a target with quickly-changing optical characteristics, simultaneous acquisitionof multidimensional information is realized, and inversion and recognition precision of the target can be remarkably improved.