PURPOSE: A polluted soil treatment method, a polluted soil treatment system, and a polluted soil classifying trommel are provided to improve the treatment efficiency of soil polluted with heavy metals. CONSTITUTION: A polluted soil treatment method includes the following: middle sized materials and small sized materials are sorted from polluted soil in a clay-pigeon hooting place using a trommel(20); sorted middle-sized materials are fed into a first jig; overflown materials from the first jig is fed into a second spiral distributing classifier to classify clay-pigeon pieces; sorted small sized materials are fed into a second jig; and underflown materials from the second jig is fed into a third spiral classifier to classify buckshot. [Reference numerals] (AA) Large-sized materials(more than or equal to 10mm); (BB) Middle-sized materials(3-10mm); (CC) Small-sized materials(less than or equal to 3mm); (DD,KK) Purified soil; (EE,LL) Clay-pigeon pieces; (FF) Buckshot(lead ammunition), heavy minerals; (GG) Fine grain materials(less than or equal to 1mm); (HH) Middle grain materials(1-3mm); (II) Particle materials(less than or equal to 0.075mm); (JJ) Fine materials(0.075-1mm); (MM) Polluted soil