The invention discloses a thermal treatment restoration method and system for contaminated soil. The thermal treatment restoration method for the contaminated soil comprises the following steps: crushing, conveying, burning, thermally desorbing, recovering heat energy, neutralizing with acidic materials, and dedusting. The system for executing the method comprises a soil crusher, a first carrier roller belt conveyor with a sealed cabin, a paddle dryer, a second carrier roller belt conveyor with the sealed cabin, and a rotary kiln thermal desorption unit, wherein pipes are arranged at all of the soil crusher, the first carrier roller belt conveyor, the paddle dryer, the second carrier roller belt conveyor and the rotary kiln thermal desorption unit and communicated with a secondary combustor. According to the thermal treatment restoration method and the thermal treatment restoration system disclosed by the invention, the organic matters, diffusing into the atmosphere, in the soil can be reduced; the organic matters can be completely transformed into water, carbon dioxide and other non-toxic innocuous substances, and then safely discharged through exhaust gas treatment; the heat energy in the system can be reutilized, so that the system energy consumption can be further reduced, and the economic efficiency is good; the treated soil can be recycled.