The invention discloses an automatic film coating system and an automatic film coating method for precious metal coins. The automatic film coating system comprises a production line main body as well as a loading assembly, a dust blowing assembly, a film coating assembly, a rinsing-spraying assembly, a blow-drying assembly and an unloading assembly which are sequentially connected, wherein the loading assembly is used for loading; the dust blowing assembly is used for blowing dust; the film coating assembly is used for coating the surfaces of the precious metal coins with films; the rinsing-spraying assembly is used for carrying out rinsing and spraying after the film coating; the blow-drying assembly is used for removing moisture; the unloading assembly is used for unloading; the production line main body is further provided with a mechanical arm control device which is used for placing a cleaning basket accommodating the precious metal coins to a preset station. According to the automatic film coating system and the automatic film coating method, by virtue of the loading assembly, the dust blowing assembly, the film coating assembly, the rinsing-spraying assembly, the blow-drying assembly and the unloading assembly which are sequentially connected, the automatic film coating of the precious metal coins can be realized, and manual intervention is reduced, so that the inconsistency of the film coating caused by the manual operation can be avoided, meanwhile, the continuous film coating is achieved, and the efficiency is increased.