Biomass active mud chain oil maker with drying and pyrolyzing functions and its system are disclosed. It consists of heat generating system, constant-temperature space, electromechanical integrated equipments of biomass oil purifying system and controlling system; heat generating system consists of heating furnace, feeding system, at least a set chain heat exchanger, air preheater and tailed gas treater, temperature in constant-temperature space is kept between 80-900 degree, constant-temperature space is closed case set with thermal-insulating layer periphery, each set of chain heat exchanger consists of at least one chain rope, driver, heat-transferring wall, driving chain wheel and driven chain wheel; ascending chain and descending chain get through by each chain rope, steering chain containing driving chain wheel and driven chain wheel are closed. Raw material with high-water content passes by ascending chain and descending chain as water-content evaporating section, and pyrolyzed gas evaporating section and high-temperature section. The process is carried out by evaporating, pyrolyzing, crushing for mud carbon, drying and burning. It can be used to manufacture inflammable gas, mud carbon and liquid fuel.