NOVELTY - Recycling-processing of careful selection soil extracted from earth-and-sand-type mixed waste involves performing fractionation-classification of earth-and-sand-type mixed waste, obtaining cured mixture containing mixed water, carrying out insolubilization-processing fluorine of the careful selection soil, adding humic substance and bivalent iron compound to formed fluorine insolubilization processed careful selection soil and making fluorine and phosphorus component which reacted and adsorb to humic substance.    USE - Recycling-processing of careful selection soil used for agriculture.    ADVANTAGE - The method enables efficient recycling-processing of careful selection soil by suppressing the elution amount of fluorine and hexavalent chromium for long period of time in weak acidic condition.    DETAILED DESCRIPTION - Recycling-processing of careful selection soil extracted from earth-and-sand-type mixed waste involves performing fractionation-classification of earth-and-sand-type mixed waste, in which the mass ratio of content of paper and wood chip and soil having particle size of 5 mm or less is less than 5% in careful selection soil, adding phosphorus-containing compound containing phosphorus component to careful selection soil, to obtain mixture containing mixed water, curing the obtained mixture, carrying out insolubilization-processing fluorine of the careful selection soil, to form fluorine insolubilization processed careful selection soil, adding humic substance and bivalent iron compound to fluorine insolubilization processed careful selection soil and making fluorine and phosphorus component which reacted and adsorb to humic substance by carrying out stirring process, and insolubilizing hexavalent chromium with bivalent iron compound, and set as recycling process careful selection soil. An INDEPENDENT CLAIM is included for insolubilizing agent, which comprises bivalent iron humus complex which are complex of humic substance and bivalent iron compound.