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This invention provides a full-spectrum chalcogenide optical glass, its preparation method, and optical elements. The chalcogenide optical glass comprises, by molar percentage: S: 53–67 mol%, preferably 54–66 mol%; Ga: 6–23 mol%, preferably 8–20 mol%; Sb: 6–28 mol%, preferably 10–24 mol%; CsX: 0–18 mol%, preferably 4–16 mol%, wherein X in CsX represents a halogen, preferably Cl, Br, or I. The chalcogenide optical glass provided by this invention has a transmittance range covering 0.5–14.5 μm, with a transmittance of over 58% in the 8–12 μm range, covering four atmospheric windows: visible, near-infrared, mid-infrared, and far-infrared. It exhibits good glass-forming properties and chemical stability, broadening its applications in three-spectrum full-spectrum imaging, detection, and sensing.