The fully automatic Abbe refractometer is equipped with a high-performance linear array CCD photosensitive component. Through high-speed and high-precision signal acquisition and analysis and processing technology, it is equipped with a semiconductor Peltier super temperature control system. The fully automatic Abbe refractometer can efficiently and accurately measure the refractive index (nD) of various liquids such as transparent, translucent, dark, and viscous liquids and the mass fraction (Brix) of sugar solutions.