The utility model relates to a multiple grating monochromator which uses a planar array CCD detector and which belongs to the field of optical electronic devices. A new grating plane which is parallelly combined by a plurality of gratings covers the entire spectral region of a whole wavelength range of the CCD detector. The utility model can achieve high accuracy and fast scan of wavelength in the wavelength range from 200 to 1100 nm without any mechanical drive and gearshift. The principle of the multiple grating monochromator can also be applies to infrared spectrum regions. The multiple grating monochromator has the advantages of simple structural design, high scanning accuracy of wavelength, wide spectral range, stable performance, easy debugging operation and long service life, and can be used for various spectral analyses and measurements.