The invention discloses a waste incineration system and method based on selective catalytic denitration plasma integration. The waste incineration system comprises a waste incinerator, a high-temperature heat exchanger, a high-temperature dust collector, a selective catalytic denitration plasma integration device, a low-temperature heat exchanger and a flue gas purification device. Dust collectedby the high-temperature dust collector does not contain low-temperature synthesized dioxins, and the toxicity is small. Flue gas dust formed after high-temperature dust removal is low in concentration, abrasion to a SCRCP device catalyst is small, pollution is also small, the service life of the catalyst is prolonged and chemical reaction efficiency is improved. Within the low-temperature synthesis temperature interval of 200-400 DEG C of the dioxins, the flue gas dust concentration is low, the quantity of dust catalysts required for dioxin low-temperature synthesis is decreased, the concentration of flue gas carbon granules and carbonaceous organic materials is low, matter required for dioxin low-temperature synthesis lacks, and the dioxin low-temperature synthesis amount is greatly reduced.