The invention belongs to the technical field of gemstone processing, and discloses an amber optimizing method based on a supercritical fluid technology. The method comprises the following steps: (1) pre-processing an amber raw gemstone, so that pre-processed amber is obtained; and (2) keeping the pre-processed amber in an autoclave, conducting evacuation via carbon dioxide, sealing the autoclave,filling the autoclave with high-pressure carbon dioxide, and conducting heating-up to 100-180 DEG C, wherein supercritical CO2 is formed when pressure in the autoclave is 8-12MPa, and beeswax is obtained through dissolving and permeating of the amber in a supercritical CO2 environment as well as through pressure relief and cooling. The method provided by the invention is simple and efficient; themethod can avoid influence to chemical components of the amber and can greatly reduce the transparency of the amber, and the method is obvious in effect; the adopted carbon dioxide is non-toxic and safe, so that green-going and environment-friendly foaming is achieved; and the method provided by the invention reduces glass transition temperature of the amber and formed bubbles are uniformly distributed, and visible light can undergo good reflection, so that an opacifying devitrification effect is achieved.