A waste incineration method embedded with a green technology for converting waste plastics to oil, wherein the waste incineration method comprises the following steps of: S1 operations in a pretreatment unit for dry waste: after the dry waste is subjected to a shredding treatment, transferring the dry waste, obtained by separating dry and wet wastes, to an intermediate section of a first pretreatment tank, wherein the dry waste comprises waste plastics and non-plastic wastes; melting the waste plastics in the first pretreatment tank into liquefied products by using superheated steam, and holding the non-plastic wastes in the intermediate section of the first pretreatment tank in a solid form, wherein the liquefied products collect at the bottom of the tank; transferring the non-plastic wastes to a purging-washing tank when the non-plastic wastes are accumulated to a certain material level, and washing the residual liquefied products on the non-plastic wastes by using steam and/or hot water; introducing the steam from both of the first pretreatment tank and the purging-washing tank into a catalytic cracking reactor in a state of gaseous phase; S2 operations in a cracking unit for liquefied waste plastics: pumping the liquefied products of the waste plastics obtained in the step S1 from the first pretreatment tank into the second pretreatment tank; pumping out the liquefied products of the waste plastics obtained in the step S1 after they are preheated by a second pretreatment tank; mixing the pumped liquefied products of the waste plastics with superheated steam in a mixer before a catalytic cracking reactor; and then transferring the well-mixed liquefied products of the waste plastics and superheated steam into the catalytic cracking reactor, wherein the liquefied products of the waste plastics are converted into a waste residue and high temperature oil and gas in the presence of a catalyst; and, cooling and separating the high temperature oil and gas to obtain oil-phase components comprising diesel and gasoline, and to produce a certain amount of hydrocarbon gases at the same time; S3 operations in an incineration unit for non-plastic wastes: pushing the clean non-plastic wastes washed in the step S1 to an incinerator; and, using the concomitant hydrocarbon gases and the waste residue in the step S2 as fuels of the incinerator for combustion, wherein the incinerator works in a direct combustion way or an indirect combustion way. S1 operations in a pretreatment unit for dry waste: after the dry waste is subjected to a shredding treatment, transferring the dry waste, obtained by separating dry and wet wastes, to an intermediate section of a first pretreatment tank, wherein the dry waste comprises waste plastics and non-plastic wastes; melting the waste plastics in the first pretreatment tank into liquefied products by using superheated steam, and holding the non-plastic wastes in the intermediate section of the first pretreatment tank in a solid form, wherein the liquefied products collect at the bottom of the tank; transferring the non-plastic wastes to a purging-washing tank when the non-plastic wastes are accumulated to a certain material level, and washing the residual liquefied products on the non-plastic wastes by using steam and/or hot water; introducing the steam from both of the first pretreatment tank and the purging-washing tank into a catalytic cracking reactor in a state of gaseous phase; S2 operations in a cracking unit for liquefied waste plastics: pumping the liquefied products of the waste plastics obtained in the step S1 from the first pretreatment tank into the second pretreatment tank; pumping out the liquefied products of the waste plastics obtained in the step S1 after they are preheated by a second pretreatment tank; mixing the pumped liquefied products of the waste plastics with superheated steam in a mixer before a catalytic cracking reactor; and then transferring the well-mixed liquefied products of the waste plastics and superheated steam into the catalytic cracking reactor, wherein the liquefied products of the waste plastics are converted into a waste residue and high temperature oil and gas in the presence of a catalyst; and, cooling and separating the high temperature oil and gas to obtain oil-phase components comprising diesel and gasoline, and to produce a certain amount of hydrocarbon gases at the same time; S3 operations in an incineration unit for non-plastic wastes: pushing the clean non-plastic wastes washed in the step S1 to an incinerator; and, using the concomitant hydrocarbon gases and the waste residue in the step S2 as fuels of the incinerator for combustion, wherein the incinerator works in a direct combustion way or an indirect combustion way.