The present invention provides a method for conveniently fixing pollutants in soil, which can effectively absorb the pollutants and prevent the pollutants from dissolving out of the underground water. The method comprises the following processes of laying a water retaining layer at least under the soil in a manner of inclining downwards from the periphery side under the pollutant soil towards the inside, laying an absorbing layer at the bottom of the water retaining layer laid in the inclined manner, and laying pollutant soil above the water retaining layer and the absorbing layer.