The invention discloses a double gas source high-flow pressure reducing valve. The pressure reducing valve comprises a valve body; the valve body comprises two gas inlets and at least one gas outlet; the valve body comprises two pressure reducing chambers, namely a first pressure reducing chamber and a second pressure reducing chamber; a pressure reducing component is arranged in the two pressurereducing chambers respectively; the pressure reducing component divides the pressure reducing chamber into a first space and a second space with variable sizes, and the first space is connected with the gas inlet; the gas outlet side on the valve body, corresponding to each pressure reducing chamber, is provided with a pore canal; the pore canal is communicated with the second space; and the pressure reducing strength of the pressure reducing component in the first pressure reducing chamber is lower than that of the pressure reducing component in the second pressure reducing chamber. The unique structure of the double gas source high-flow pressure reducing valve is not only applicable to different gas sources, but also applicable to the condition that the gas inlet pressure is constantly changed.