The invention discloses a soil remediation system based on a combined technology. The soil remediation system comprises a soil source conveying unit, a soil source crushing unit, an iron material adsorption unit, a soil source screening unit, a stone conveying unit, a thermal volatilization unit, a chemical cleaning precipitation unit, a dehydration unit, an air drying unit, a faeces conveying unit, a sterilization and deodorization unit, a soil and fertilizer mixing unit and a clean soil source conveying unit. According to the soil remediation system, the combined technology of physical remediation, chemical remediation and fertilizer adding treatment is adopted, and the problems that soil desertification is severe and nutrients are insufficient are further solved under the condition that soil is sufficiently remediated; a cleaning liquid recycling module has a stirring function as well, so that cost is reduced, and equipment space is decreased; disturbance of waterflow in a filter screen zone is guaranteed during the recycling process of the cleaning liquid recycling module, and the problem that a filter screen is liable to block is solved; and disturbance for bottom sediment is effectively inhibited through the cleaning liquid recycling module, and a recycled cleaning liquid does not contain soil impurities.