Combining the progresses and trends on fluidized mining with the application fruits of biosolubilization and biomethane of coal, this paper discussed the microbo technical conception to make in situ solid coal a flow for fluidization exploitation.From the perspective of the comprehensive utilization of gaseous and liquid products, the biodegradation pathway of coal and the formation of fluidized products were given.On this basis, the concept of biologically fluidized coal mining was proposed, which enriches the connotation of solid resources fluidized mining.From the characteristics of biologically fluidized coal mining, the implementation method, production system and process flow of biologically fluidized coal mining were explored.The key technologies and application prospects of in situ biofluidized coal mining were analyzed.The technical concept of in situ biologically fluidized mining of coal has been initially established, providing new ideas for scientific, efficient and green coal mining.