This experimental study on plasma pyrolysis of corn stalk and the feature of bio-oil was carried out in a self manufactured small fluidized bed reactor with corn stalk. Results showed that the temperature in the fluidized bed was steady under the condition of adopting the plasma body to heat the reactor, and the preheat time is 1.5h. The heating value of pyrolysis liquid—bio-oil was analyzed. The heating value of crude bio-oil obtained is 18066.62kJ/kg. Heating value after taking off carbons is lower by 3446.71kJ/kg than that of before taking off carbons. Thus, there is some certain solid charcoal in the bio-oil. The bio-oil after taking off the carbon was get rid of the water, which heating value is one time higher than that of the bio-oil after only taking off the carbon, with the difference of 14345.95kJ/kg.