On-line wavelength dispersion analyzer light path device capable of being automatically adjusted

The utility model provides an on-line wavelength dispersion analyzer light path device capable of automatically adjusting, which comprises a crystal table and a crystal seat which are arranged in a light splitting shell, a light splitting crystal is arranged on the crystal seat, the crystal seat is connected with the crystal table through a shaft pin, the crystal seat can rotate, and the rotation angle of the crystal seat is adjusted by controlling the rotation of a rotating shaft through a motor. The rotation angle of the crystal holder is indirectly recorded through a multi-circle absolute value encoder, and the optimal rotation angle of the crystal holder is determined by processing the spectrum shape of counting rate-rotation angle. By controlling the motor, the light path is automatically adjusted, so that the effect of the whole light path is optimal, the situation that the analysis precision of an instrument is reduced due to the influence of adverse factors such as environment temperature change and v