The invention relates to an agricultural waste low energy consumption circulating fluidized bed carbonization device. A partition wall pipeline is arranged in a furnace hearth; the top end hole of the partition wall pipeline extends out of the top surface of the furnace hearth; a first powder feeding device is communicated with the top end hole of the partition wall pipeline; a second powder feeding device is communicated with the interior of the furnace hearth; one end of a coke sample conveying auger is arranged at the bottom of a coke discharge chamber; the other end of the coke sample conveying auger is arranged in a coke pyrolysis storage chamber; an overflow pipe, a fluidizing air hole and an air conveying pipe are arranged on the top surface of an air distribution chamber; the input end of the air conveying pipe penetrates through the bottom surface of the air distribution chamber and is communicated with the output end of an air compressor; a flue gas pipeline is arranged on the bottom surface of the air distribution chamber; one end of the flue gas pipeline is communicated with the furnace hearth through the fluidizing air hole; the other end of the flue gas pipeline is communicated with the output end of a flue gas circulation fan; the input end of a cyclone separator is communicated with the furnace hearth; a first output end of the cyclone separator is communicated with the lower part side wall of the furnace hearth; a second output end of the cyclone separator is communicated with the input end of a gas purification system. The agricultural waste low energy consumption circulating fluidized bed carbonization device realizes efficient treatment of agricultural wastes with low energy consumption.