NOVELTY - Rice-wheat harvesting and straw carbonizing and field-returning integrated device comprises a rice wheat harvesting threshing and straw cutting device, and a straw carbonizing and flue gas purifying device. The rice and wheat harvesting threshing and straw cutting device comprises a header (1), a first feeding pipe (5) and a grain cabin. The straw carbonizing and flue gas purifying device comprises e.g. a rotary drying furnace, a gas purifying chamber (6), a gas conveying pipe (7), a chimney, a second feeding pipe and a draught fan. The second feeding pipe fork is divided into two branches.    USE - Used as a rice-wheat harvesting and straw carbonizing and field-returning integrated device.    ADVANTAGE - The device: has high carbon production rate; simultaneously completes rice-wheat harvesting, straw carbonizing and field returning; and saves the transportation cost.    DETAILED DESCRIPTION - Rice-wheat harvesting and straw carbonizing and field-returning integrated device comprises a rice wheat harvesting threshing and straw cutting device, and a straw carbonizing and flue gas purifying device. The rice and wheat harvesting threshing and straw cutting device comprises a header (1), a first feeding pipe (5) and a grain cabin. The straw carbonizing and flue gas purifying device comprises a rotary drying furnace, a gas purifying chamber (6), a gas conveying pipe (7), a chimney (8), a second feeding pipe, a draught fan and carbonization chambers. The one side of the rotary drying furnace is connected with the first feeding pipe, and the other end side of the rotary drying furnace is connected with the second feeding pipe. The second feeding pipe fork is divided into two branches entering into the carbonization chambers. A timing switch and a baffle are set to control the drying straw transportation branch to ensure that the materials are conveyed into the two carbonizing chambers at intervals. The inner part of the rotary drying furnace is provided with three hollow fan blades. The one end of the rotary drying furnace far away from the feeding pipe is connected with the gas conveying pipe, where the hollow fan blade of the rotary drying furnace can have high temperature hot air, and can simultaneously rotate for heating and drying the straw. The one end of the rotary drying furnace close to the feeding pipe is connected with the chimney. The carbonizing chamber is divided into inner and outer layers. The inner part of the carbonizing chamber is a combustion chamber for straw direct combustion. The outer ring is a carbonized zone. The carbonizing chamber is provided with multiple air inlet pipes. An air inlet pipe is connected with the outside of the carbonizing chamber through one end, and the other end of the air inlet pipe is connected to the carbonized zone. Each air inlet pipe is arranged on the air spraying opening of the carbonization chamber, which is further provided with a combustion chamber pipe, which is connected with the outside of the combustion chamber. The other end of the combustion chamber is provided under the vortex fan. The carbonization chamber is provided with multiple lower feeding pipes. Each lower feeding pipe is a groove-shaped sharp knife edge used for harvester operation process on the ground and the groove, where the biomass carbon uniformly fertilizes in the groove. The multiple feeding pipes are set in the field device. The carbonizing chamber wall is provided with an igniting ventilation opening, an ignition air flashboard. The high temperature hot air of the carbonization chamber is pumped into the gas purifying chamber by the draught fan. The gas purifying chamber comprises a metal baffle plate, a metal filter, an activated carbon layer, an anti-showering draught fan, an exhaust pipe, a combustion chamber and a tar collecting tank. The gas purifying chamber is connected with the rotary drying furnace through the gas conveying pipe.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the rice-wheat harvesting and straw carbonizing and field-returning integrated device.    Header (1)    First feeding pipe (5)    Gas purifying chamber (6)    Gas conveying pipe (7)    Chimney (8)