The invention discloses a device for reducing the consumption of raw materials in a propene carbonylation process. A heat exchanger and a high-pressure evaporator collection groove are connected with a heat exchanger shell pass; a shell pass outlet is connected with an electric heating furnace, a fixed bed reactor and a first cooler; the first cooler is connected with a heat exchanger tube pass; a tube pass outlet is connected with a second cooler, a compressor, an air cooler and a flash drum; the top of the flash drum is connected with a synthetic gas input pipeline and the bottom of the flash drum is connected with a depropanization tower; the top of the depropanization tower is connected with a propene input pipeline; the bottom of the depropanization tower is connected with the heat exchanger shell pass; a method comprises: inputting gas released by a second carbonyl synthetizing reactor and the high-pressure evaporator collection groove into the heat exchanger and enabling the gas to pass through the electric heating furnace; enabling the gas to enter the fixed bed reactor; conveying a first mixed material into the heat exchanger through the first cooler; conveying hydrogen gas to a first carbonyl synthetizing reactor through the second cooler, the compressor and the flash drum I; conveying a bottom material of the flash drum to the depropanization tower and conveying propene to the first carbonyl synthetizing reactor; returning the propene back to the heat exchanger shell pass. By adopting the device and the method, provided by the invention, the consumption of the raw materials in an industrial production process is reduced.