The invention relates to a probe type digital display refractometer, comprising a main machine (1) and a probe (7); the probe type digital display refractometer is characterized in that the main machine (1) is internally divided into an upper layer and a lower layer; the upper layer in the main machine (1) is an optical signal sending side, and the lower layer in the main machine (1) is an opticalsignal receiving side; an optical fiber interface (6) is formed in one side wall of the main machine (1); an optical fiber connector (9) is connected with the optical fiber interface (6); the opticalfiber connector (9) is connected with the probe (7) by means of an optical fiber (8); a display screen (2), an on-off key (3), an adjusting key (4) and a locking key (5) are separately arranged on the upper surface of the main machine (1). The probe type digital display refractometer overcomes the influence of visual reading errors in the prior art and realizes the real-time online measurement ofrefractive indexes within a certain range; non-sampling measurement is realized in the environment where the probe can intervene, and the size of the probe is greatly reduced by means of optical pathdesign; therefore, the probe type digital display refractometer is suitable for applications such as oil measurement and sugar measurement.