The invention discloses a precious metal coating line device. The precious metal coating line device comprises a production line main body, and a feeding tank, a coating tank, a sprinkling tank, a blow-drying tank and a tray loading mechanism, which are sequentially connected, wherein precious metal commemorative coins are loaded into coating line clamps by the production line through the feeding tank, and coating, washing and blow-drying procedures are carried out on the commemorative coins clamped by the clamps via the coating tank, the sprinkling tank and the blow-drying tank; and finally, the commemorative coins are released into the tray loading mechanism, and tray loading treatment is carried out on the commemorative coins. The precious metal coating line device has the advantages that coating treatment, washing treatment and blow-drying treatment are separately carried out on single commemorative coin, water drops left on the surfaces of the coins are blown dry to an utmost extent, the uniformity of coating effects can be ensured, manual treatment difference is avoided, production technical requirements are met, and commemorative coin coating automatic treatment is realized.