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The five pyrolyzing furnaces which adopted grading heating technology was developed to solve the problem of bad control of temperature in the process of biomass pyrolysis. Combining with continuous conveying principle, circulating water cooling technology, secondary cracking technology of pyrolysis gas, secondary condensing collection of bio-oil and biogas, the equipment for biomass continuous grading pyrolysis was developed. Each furnace was heated by a 3kW electric wire with PID control allowing a wide range of heating rates and a maximum temperature of 700℃. Pyrolysis test which used the crushing corn straw was completed after the pellet equipment was made, results showed that the equipment worked well and the feed throughput can be up to 12kg/h, the yield of carbon was 29.97%, the low calorific value was 26.21MJ/kg, the yield of fix-carbon was 55.63% and the temperature of collected carbon was 24℃ when the temperature of furnace was set at 550℃, 600℃, 600℃, 600℃ and 550℃, respectively, after separation of pyrolysis gas and bio-oil, the pyrolysis gas flow into an afterburner chamber where enough air fuelled ensured complete combustion, which conformed to the demand of grading heating and continuous pyrolysis.