NOVELTY - Oil producing system comprises sludge drying device, sludge-oil producing device, garbage burning furnace, residual heat boiler, generating device, and sludge drying device. The sludge drying device receives dewatered sludge to produce drying sludge and drying waste gas. The sludge oil-producing device receives drying sludge from sludge drying device to produce pyrolytic oil, non-condensing gas, and residual carbon. The garbage burning furnace receives external garbage, non-condensing gas, and residual carbon, and selectively receives pyrolytic oil.    USE - System for producing oil (claimed).    ADVANTAGE - The method garbage makes full use of system energy, and reduces investment and operation cost of waste material treatment.    DETAILED DESCRIPTION - Oil producing system comprises sludge drying device, sludge-oil producing device, garbage burning furnace, residual heat boiler, generating device, and sludge drying device. The sludge drying device receives dewatered sludge to produce drying sludge and drying waste gas. The sludge oil-producing device receives drying sludge from the sludge drying device to produce pyrolytic oil, non-condensing gas, and residual carbon. The garbage burning furnace receives external garbage, non-condensing gas, and residual carbon from the sludge oil-producing device; and selectively receives part(s) of pyrolytic oil from the sludge oil-producing device to produce hot smoke. The residual heat boiler receives hot smoke from the garbage burning furnace and exchanges heat with the hot smoke to produce vapor. The generating device generates power using vapor from residual heat boiler and provides part(s) of the power to the sludge oil-producing device. The sludge drying device receives part(s) of smoke after exchanging heat by the residual heat boiler and selectively receives part(s) of vapor from the residual heat boiler. The oil is from sludge and burning waste. An INDEPENDENT CLAIM is included for producing oil comprising using sludge and burning waste; introducing the dewatered sludge into the sludge drying device to produce drying sludge and drying waste gas; introducing the drying sludge into the sludge oil-producing device to produce pyrolytic oil, non-condensing gas and residual carbon; introducing external garbage, non-condensing gas and residual carbon from the sludge oil-producing device into the garbage burning to produce hot smoke; introducing the hot smoked from the garbage burning furnace into the residual heat boiler to produce vapor; using the vapor from the residual heat boiler to generate power and provide part(s) of the power to the sludge oil-producing device; and introducing part(s) of the smoke after exchanging heat by the residual heat boiler into the sludge drying device.