Small grain dryer

The invention discloses a small grain dryer comprising a feed hopper. The feed hopper is connected to the inlet of a drying rolling drum; the outlet of the drying rolling drum is connected to the inlet of a cooling rolling drum, the outlet of the cooling rolling drum is connected to a discharge hopper, and the air inlet of the drying rolling drum is connected to a hot air outlet of a straw combustion furnace; the drying rolling drum comprises an outer heat insulation drum, the outer heat insulation drum is provided with an inner rolling drum inside, asymmetric copy boards are distributed on the wall of the inner rolling drum circumferentially, the inner rolling drum is provided with hot air flowing holes, and the inner rolling drum and the outer heat insulation drum are sealed through a sealing sleeve; the outer heat insulation drum is fixed, and the inner rolling drum is capable of rotating; the inner rolling drum is provided with a temperature sensor, a humidity sensor and a microprocessor inside, the temperature sensor and the humidity sensor transmit the acquired data to the microprocessor, and the microprocessor transmits the data to an upper computer; the drying rolling drum, the cooling rolling drum and the straw combustion furnace are arranged on a trailer. By the aid of the small grain dryer, the problems of rural straw combustion and grain drying can be solved.