The invention discloses a device for producing mercury standard gas and divalent mercury standard gas on the basis of the saturation principle. The device comprises an element mercury standard gas generating system and a divalent mercury standard gas generating system, wherein the element mercury standard gas generating system comprises a first carrier gas device and an element mercury generator which are sequentially connected by the aid of a pipeline, and the element mercury generator is used for producing mercury gas; the divalent mercury standard gas generating system comprises a plasma gas source device, a gas premixing chamber and a divalent mercury generator which are sequentially connected by the aid of a pipeline, the divalent mercury generator is used for producing divalent mercury gas, the gas premixing chamber is further connected with an outlet of the element mercury generator and is used for mixing a plasma gas source with mercury-containing gas produced by the element mercury generator, the divalent mercury generator is provided with a high-frequency high-voltage alternating-current power generator and is used for producing plasma to oxidize the mercury-containing gas into divalent mercury gas, the element mercury standard gas and the divalent mercury standard gas are obtained simultaneously, the same mercury source is adopted, the problem that source tracing delivery is required to be performed twice due to inconsistent mercury sources caused by adoption of the different mercury sources is solved, and operation steps are simplified.