The invention discloses a grain processing device. A machine body is included. Stand bars are arranged on the left side and the right side of the lower end of the machine body. A feeding hopper is arranged at the middle portion of the upper end of the machine body. A first support plate is arranged at the upper portion of the left side of the machine body. A first motor is arranged at the upper end of the first support plate. The right end of the first motor is in power connection with a first rotation shaft. The right end of the first rotation shaft penetrates through the machine body, and the right side of the first rotation shaft is rotationally connected with the right side wall of the machine body through a first bearing. The right end of the first rotation shaft extends rightwards soas to stretch out of the machine body and is fixedly provided with a first belt barrel. A stirring sheet is arranged at the upper middle portion of the first rotation shaft. The parts, on the left side and the right side of the stirring sheet, of the first rotation shaft are provided with heaters. The heaters are provided with a plurality of stirring arms. Each heater comprises a barrel sleeve, aheat radiation block and heating blocks, wherein the barrel sleeve sleeves the first rotation shaft, the heat radiation block is arranged on the outer side of the barrel sleeve, and the multiple heating blocks are arranged in the heat radiation block.