The invention relates to a jewelry faceting machine. The machine comprises a base, a fixed mount and a driving mechanism which are installed on the base, and a rotating base which is connected to thedriving mechanism and a clamping mechanism which is connected to the fixed mount; a material placing ring is arranged at the end part of the rotating base; the clamping mechanism comprises an angle adjusting component which is connected to the mount, an adjusting rod which is connected to the angle adjusting component, a clamping element which is sleeved on the adjusting rod and a first fastener which is connected to a clamping element, one end of the first fastener closed to the clamping element extends and is provided with a ferrule, and in the usage state, the first fastener tightly sleeveson the ferrule, in order to fix the ferrule. The machine can be used for automatically positioning jewelry to be processed, according to demands, faceting depth can be adjusted, manual operation is not needed, product quality is improved, and machining efficiency and product benefits are improved.