Oil emission spectrometer beam splitting system and device covering ultraviolet, visible and near-infrared bands

The utility model discloses an oil emission spectrometer beam splitting system and device covering ultraviolet, visible and near infrared bands, the system comprises a Rowland beam splitting light path and a flat field light path, the Rowland beam splitting light path comprises a Rowland circle, a concave grating, an entrance slit, a Rowland circle spectrum surface and a CCD collector; the flat field light path is arranged above the horizontal diameter of the Rowland circle and is positioned on the same plane with the Rowland light splitting light path, and the flat field light path comprises a zero-order reflecting mirror which is positioned on a zero-order light path emitted by the concave grating; the secondary light splitting slit is located on a reflection light path of the zero-order reflector, and the distance of the light from the zero-order reflector to the secondary light splitting slit is equal to the distance of the center of the zero-order reflector to the Rowland circle; the secondary light spli