Photosensitive seal is a manufacturing technology that transfers patterns or characters to the surface of seal through exposure. Using photosensitive film or photosensitive resin, after treatment, it can absorb photosensitive special ink to form a seal pattern with high definition and bright color. Photosensitive seals are flexible in production and good in printing effect, and are widely used in the production of official seals, company seals and other seals.