Biomass high-temperature pre-pyrolysis system

The invention provides a biomass high-temperature pre-pyrolysis system which can be used for separating pyrolysis gas for multiple times and classifying separated materials, and comprises a pyrolysis reactor hearth, a feeder, a bottom tiny-oil igniter, a cyclone separator I, a cyclone separator II and a biomass residue recycling machine, pyrolysis gas is subjected to double purification through the first cyclone separator and the second cyclone separator, and meanwhile residues are separated for sufficient combustion and recovery. The ultra-low NOx emission in the furnace can be realized, meanwhile, the pressure-bearing component of the pyrolyzer does not need to be changed, the transformation is simple, and the construction period is short. The maintenance cost is low in the operation process, and convenience and rapidness are achieved. The pyrolysis efficiency can be greatly improved in the pyrolysis process. Meanwhile, the biomass residues recycled by the residue recycling machine are rich in various trace