NOVELTY - An eccentric-type biomass fast thermal cracking reactor (R1) comprises bracket, shell, shutter, feeder body, stock bin, reactor outside body, reactor inside body, rotor shaft and cover plate. The reactor outside body has conical cavity or cylindrical cavity. The reactor outside body is internally provided with reactor inside body. The reactor outside body is in shell and is fixedly connected to bottom surface of the shell. The upper end of shell is provided with cover plate, where heating tube is arranged between outer surface of reactor outside body and shell    USE - Eccentric-type biomass fast thermal cracking reactor (R1).    ADVANTAGE - The reactor (R1) transfers heat to biomass directly by means of reactor inside and outside bodies, thus reducing heat loss and difficulty of separating impurity before condensing after gasifying biomass, and providing guarantee of continuous production of device.    DETAILED DESCRIPTION - Eccentric-type biomass fast thermal cracking reactor (R1) comprises bracket, shell, shutter, feeder body, stock bin, reactor outside body, reactor inside body, rotor shaft and cover plate. The reactor outside body has conical cavity or cylindrical cavity. The reactor outside body is internally provided with reactor inside body which is of conical cavity or cylindrical cavity. The reactor outside body is in shell and is fixedly connected to bottom surface of the shell. The upper end of shell is provided with cover plate, where heating tube is arranged between outer surface of reactor outside body and shell, and biomass feed inlet is deposited between reactor inside body and reactor outside body. The reactor inside body is connected to rotor shaft by a thread, and rotating center of rotor shaft deviates from geometrical center line of reactor inside body, and offset is one quarter to one half of maximum diameter difference of reactor outside body and reactor inside body. The rotor shaft is fixedly on bracket by bearing, where sealing filler strip is provided between rector outside body and cover plate, and sealing cover is provided between rotor shaft and cover plate. The reactor inside cavity is internally provided with a heating tube. The rotor shaft is connected to motor by transmission chain, transmission chain wheel and speed reducer, where first collecting cavity is formed between lower end of reactor outside body and bottom surface of shell, while second collecting cavity is formed between cover plate and upper end of reactor outside body, and thermal cracking gas conveying tube is connected to first collecting cavity and second collecting cavity, respectively. The thermal cracking gas conveying tube is further connected to cyclone separator connected to a condenser.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating an eccentric-type biomass fast thermal cracking reactor.