The present invention relates to a system (1) for pasteurisation thermal treatment of foodstuffs, particularly leaf products, comprising means (5a) for loading the product to be subjected to treatment and means (5b) for discharging the treated product, characterised in that it comprises a first treatment section (2) in which the product to be subjected to treatment is conveyed by said loading means (5a), said first treatment section (2)heating said product by a treatment fluid, so as to reduce starting concentration of thermo sensitive bacteric flora present in the same； and a second treatment section (3), provided in cascade with said first treatment section (2), said second treatment section (3) cooling the product by said treatment fluid, so as to stop growing of residual bacteric flora present.
