The invention relates to contaminated soil treatment equipment through leaching. The contaminated soil treatment equipment comprises a crawler-type road roller, a screening and crushing system, a pulping system, a soil treating system and a medicament feed system; the screening and crushing system is used for breaking hard soil blocks in contaminated soil and screening impurities such as rocks and plastic in the contaminated soil; the pulping system is used for further removing large-particle substances in the contaminated soil, so that the treatment amount of the contaminated soil is reduced, and the treatment cost is reduced; through the adoption of the soil treating system, quick remediation of the contaminated soil through leaching is realized; through the adoption of the medicament feed system, the feed of medicaments and reutilization of a leacheate is realized. All materials and devices are mounted on the crawler-type road roller, so that the transportation and the construction are convenient. The contaminated soil treatment equipment integrates functions of soil excavation, soil screening, medicament adding, soil leaching, leacheate reutilization and automatic control, is compact in structure, convenient to operate and high in suitability and efficiency, is suitable for application of large-scale engineering, and can realize efficient and quick remediation of various contaminated sites.