The invention relates to a multi-furnace biomass solid waste gasification furnace parallel treatment system and method. The parallel treatment system comprises at least two pyrolysis gasification furnaces, one pyrolysis gas even mixing device and a pyrolysis gas burning chamber. The pyrolysis gas even mixing device is used for collecting gas generated in the pyrolysis gasification furnaces and enables the gas to be evenly mixed; and the pyrolysis gas burning chamber uses the evenly-mixed pyrolysis gas in the pyrolysis gas even mixing device as fuel, and provides a heat source for pyrolysis for the pyrolysis gasification furnaces. According to the parallel treatment system, the multiple pyrolysis gasification furnaces are connected in parallel and are independent of each other, and the number of the pyrolysis gasification furnaces which are connected in parallel for work can be selected according to the treating need; and after the pyrolysis gas generated by the pyrolysis gasification furnaces are mixed, the mixed pyrolysis gas enters the pyrolysis gas burning chamber, complementary cooperation of the pyrolysis gas in the different furnaces is achieved, differences of pyrolysis gas contents and burning heat in the system can be decreased, the stability of temperature in the pyrolysis gasification furnace system is guaranteed, and the tail gas standard reaching efficiency is improved.