The invention discloses a micron carbon fluid gaseous-phase bubbling device and a micron carbon fluid gaseous-phase bubbling method for direct carbon fuel cells. The micron carbon fluid gaseous-phase bubbling device and the micron carbon fluid gaseous-phase bubbling method have the advantages that turbulences are formed by a fluidized bed, an air distributor is arranged at an anode air inlet, carbon dioxide generated from a reaction between carbon and oxygen bubbles under the action of an anode gas circulation device and the air distributor, carbon particles gather on the surfaces of bubbles highly densely, local carbon concentration is increased, the bubbles are broken when contacting with an anode, laminar flow inner layers are eliminated, and the mass transfer velocity is increased to increase battery power density; carbon fuel microns are processed into the carbon particles, micron fluids are formed under the action of fluidized gases, and two dimensions of a direct electrochemistry reaction interface of carbon fuel are expanded into three dimensions, so that reaction interfaces and reaction frequencies of gas, liquid and solid phases are increased, mass transfer velocity is increased greatly, and power density in unit time and space is increased; a compound solution comprising three solutions serves as an electrolyte, so that physical property of the electrolyte is optimized and turbulence velocity of the electrolyte is reduced.