A polluted soil remediation apparatus (1) comprising a treatment tank (5) in which pollutants degradable with light irradiation (9) in the presence of chlorine is extracted as a gas containing the pollutants from polluted soil and a mixture of the gas containing the pollutants and chlorine-containing air is irradiated with light to degrade the pollutants, wherein the apparatus comprises a unit (3) for aspirating the gas containing the pollutants from the polluted soil, a chlorine-containing air generation unit for generating the chlorine-containing gas, a mixing unit for mixing the gas containing the pollutants extracted by the aspiration unit and the chorine-containing air generated by the chlorine-containing gas generation unit to form a mixed gas, the treatment tank (5) comprising a treatment region where the mixed gas is introduced and a light irradiation unit (9) for irradiating the treatment region with light to degrade the pollutants contained in the mixed gas, and an exhaust unit for exhausting the degradation-treated gas from the treatment region of the treatment tank.
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