NOVELTY - Manufacturing biomass pyrolysis oil, comprises: (i) crushing and drying biomass raw material; (ii) drying quartz sand and adding into fluidized bed; (iii) controlling fluidized bed temperature to 480-580 degrees C and pre-heater temperature to 250-350 degrees C by continuously introducing nitrogen or recycled gas, and maintaining pressure to 0.1-0.2 MPa; (iv) simultaneously adding biomass raw material granule and passing nitrogen gas into the fluidized bed to carry out pyrolysis reaction; and (v) separating the reaction product by a cyclone separator and passing the residual carbon residue into a condenser.    USE - The method is useful for manufacturing biomass pyrolysis oil (claimed).    ADVANTAGE - The method produces high yield using agricultural waste, recovers by-product gas and does not produces waste residue, waste water and waste gas.    DETAILED DESCRIPTION - Manufacturing biomass pyrolysis oil, comprises: (i) crushing biomass raw material into less than 20-meshes granules, drying to obtain moisture content of less than 5 wt.% and storing under moisture-proof condition; (ii) drying quartz sand having particle size of 20-50-meshes to obtain moisture content to less than 0.1 wt.%, then adding into fluidized bed; (iii) controlling fluidized bed temperature to 480-580 degrees C and pre-heater temperature to 250-350 degrees C by continuously introducing nitrogen or recycled gas as a carrier gas to make oxygen-free atmosphere, and maintaining pressure to 0.1-0.2 MPa; (iv) simultaneously adding biomass raw material granule and passing nitrogen gas in a flow ratio of 1:4-5 into the fluidized bed via screw feeder to carry out pyrolysis reaction and make convert material into fluidized state; and (v) separating the reaction product by a cyclone separator, passing the residual carbon residue into a condenser to condense bio-oil and non-condensable gas, passing a portion of non-condensable gas via gas burner for heating fluidized bed and pre-heater, and recovering another portion of gas.