NOVELTY - Preparing biomass by continuous type microwave pyrolysis comprises (i) crushing the solid waste or cutting to maximum size material; (ii) passing the material into storage silo, then into pyrolysis furnace, and carrying out pyrolysis in pyrolysis furnace; (iii) providing high temperature oscillation screen between the pyrolysis furnace outlet and carbon residue discharge screw conveyor, completing pyrolysis, sieving, and discharging the slag in the reservoir tank; and (iv) passing the pyrolysis gas, rapidly cooling, taking the condensable gas as biomass crude oil, and condensing.    USE - The method is useful for preparing biomass by continuous type microwave pyrolysis.    DETAILED DESCRIPTION - Preparing biomass by continuous type microwave pyrolysis comprises (i) crushing the solid waste or cutting to maximum size of 50x 50x 50 mm material; (ii) passing the material into storage silo via vacuum suction device, then into pyrolysis furnace via flapper valve, and controlling the automatic feeding; maintaining the pyrolysis furnace vacuum degree to -0.03 to -0.01 MPa, and temperature to 550 degrees C; acquiring energy by plastic cleavage, passing the energy into pyrolysis furnace via microwave generator through a waveguide, where the microwave generator has power of 9 KW, and frequency of 2450 HMZ; and the pyrolysis furnace is provided with helical screw configuration, which ensures material transport and flip function, so as to make pyrolysis more even, and the conveying speed is adjustable; (iii) providing high temperature oscillation screen between the pyrolysis furnace outlet and carbon residue discharge screw conveyor, completing pyrolysis, sieving, and discharging the slag in the reservoir tank via carbon residue discharge screw conveyor, using to prepare organic fertilizer; and passing the incompletely cleaved coarse particles into material inlet by screw conveyor directly, to form a closed loop system; and (iv) passing the pyrolysis gas produced into three-stage condenser, rapidly cooling, taking the condensable gas as biomass crude oil, condensing and passing into storage tanks; passing the non-condensable gas through oil separator into wash tank, further drying in the gas tank, generating power by a gas generator for power generation, and providing powder to the entire system; passing cooling water into the cooling water tank, cooler and then into the condenser, recycling water by reflux condenser; and cooling using plate heat exchanger.