PURPOSE: Provided are a method and an apparatus for soil remediation and wastewater purification by electron beam irradiation, which can decompose nonbiodegradable organic materials in soil flushing water and volatile gas by oxidizing and reducing those nonbiodegradable materials by radicals and water-soluble electrons which have high reactivity and are generated by emitting electron beam to the soil flushing water and volatile gas. CONSTITUTION: The apparatus comprises a collecting unit(110) for extracting and collecting wastewater and gas generated by soil and ground water remediation process, a transportation pipe(270) connected to the collecting unit(110) for transporting collected wastewater and gas, a reaction tank(240) connected to the transportation pipe(270) for receiving the wastewater and gas, and an electron beam accelerator(220) for emitting electron beams to the wastewater and gas in the reaction tank(240), wherein the collecting unit(110) includes a flush tank(120) for flushing evacuated soil,
