Abstract: Antimony telluride (Sb₂Te₃) is a new type of two-dimensional layered material, in this paper, the "top-down" ultrasonic exfoliation method was used to prepare antimony telluride quantum dots (Sb₂Te₃ QDs) for the first time, with antimony telluride powder as raw material, and N-methyl pyrrolidone (NMP) as the dispersant. A variety of characterizations(SEM, TEM, AFM, XPS, XRD, etc.) for the structure and morphology of the prepared Sb₂Te₃ QDs were performed. The optical properties of Sb₂Te₃ QDs were studied using UV-Vis, PL and PLE. It is found that the average particle size of the prepared Sb₂Te₃ QDs is 2.3 nm, and the average height is 1.9 nm, with a good dispersive particle size uniformity, the PL and PLE peaks have a redshift, both PL and PLE are dependent on the excitation wavelength and emission wavelength. It is also found that Sb₂Te₃ QDs has obvious absorption and photoluminescence in the infrared band. The results indicate that the ultrasonic exfoliation method is feasible to prepare Sb₂Te₃ QDs, the characteristics of the material show the potential application in infrared detector.