The invention relates to a platinum channel mixing barrel and a platinum channel mixing barrel device. The platinum channel mixing barrel comprises a stirring barrel body with a barrel opening, a molten glass inlet and a molten glass outlet, wherein the mixing barrel body is also communicated with a hot-gas supply device for blowing an inert hot gas into a space above a free water surface in the mixing barrel body, so that the inert hot gas blown by the hot-gas supply device flows into the space above the free water surface and then is sent out from the barrel opening. Oxygen in the space is diluted and discharged by blowing the inert hot gas into the space above the free water surface in the mixing barrel body, so that volatilization of a precious metal component exposed in the space is inhibited and a precious metal volatile matter of generating precious metal defects is reduced from the source. The generated precious metal volatile matter can be taken out of the space along with continuous injection of the inert hot gas into the space above the free water surface, and the condensation of the precious metal volatile matter can be reduced, so that the probability of generating the precious metal defects in a glass substrate is reduced and the yield and the quality of a product are improved.