The invention discloses a pearl brightening technology. The pearl brightening technology comprises the following steps: a) pouring polyethylene glycol, glycerol, methylene blue and de-ionized water into a container and uniformly mixing to prepare brightening liquid for later use, wherein the mass ratio of each component is as follows: 10 to 20 parts of the polyethylene glycol, 10 to 20 parts of the glycerol, 4 to 6 parts of the methylene blue and 900 to 1,000 parts of the de-ionized water; b) pouring the brightening liquid and pearls to be treated into a brightening device and immersing for 3to 5 days at the immersing temperature of 10 to 20 DEG C; then washing with water, naturally drying and the like. Compared with the prior art, the brightening effect can be good and the permeability of the pearls is not influenced.