Provided is a biomass rotary propulsion pyrolysis device. The device comprises a pyrolysis device body, the pyrolysis device body is connected to a rotary device, and comprises a feed pipe (1), a discharge pipe (8) and several pyrolysis pipes (4), the outlet of the feed pipe (1) is fixedly connected to the inlets of the several pyrolysis pipes (4) separately, the outlets of the several pyrolysis pipes (4) are fixedly connected to the inlet of the discharge pipe (8) separately, the feed pipe (1) is internally provided with a feed helical blade (2), the discharge pipe (8) is internally provided with a discharge helical blade (9), the pyrolysis pipes (4) are internally provided with pyrolysis helical blades (5), and several means one or more. Through the biomass rotary propulsion pyrolysis device, the problem of pool sealing caused by a complicated mechanism in which the helical blades need to rotate and transmit solely is solved, and the device has good economic and environmental protection effects.