The invention belongs to the technical field of boilers and discloses an efficient environment-friendly garbage pyrolysis gas boiler system. The efficient environment-friendly garbage pyrolysis gas boiler system comprises a garbage incineration site, an integrated reactor, a pyrolyzer and a boiler which are connected in sequence; the boiler comprises a combustor, a boiler body and a flue gas duct;the boiler body comprises a front flue gas box, a boiler shell, one or more flue gas pipes and a rear flue gas box, the lower portion of the interior of the boiler shell is provided with a hearth anda backdraft chamber, and the upper portion of the interior of the boiler shell is provided with a steam water chamber; the flue gas pipes are installed in the steam water chamber and connected between the backdraft chamber and the flue gas duct; the backdraft chamber communicates with the tail end of the hearth; the front flue gas box and the rear flue gas box are arranged at the two ends of theboiler shell correspondingly; the combustor communicates with the hearth through the front flue gas box, and the flue gas duct is connected with the rear flue gas box; and garbage pyrolysis gas generated through the garbage incineration site sequentially passes through the integrated reactor and the pyrolyzer to enter the combustor and finally enter the hearth to be burned. The garbage pyrolysis gas serves as fuel and is subjected to high-temperature combustion decomposition in the hearth by being matched with the structural arrangement of the boiler body, and the risk caused by directly discharging harmful matter into the atmosphere is reduced.