To provide a solar heat soil sterilization system which has a high heat-insulating effect and can simply be built.

This solar heat soil sterilization system is characterized by spreading a plurality of approximately cylindrical heat-insulating cylinders 3, 3 over soil to be sterilized in parallel in the side direction so that the adjacent heat-insulating cylinders 3, 3 are substantially brought into contact with each other without forming a space. Each of the approximately cylindrical heat-insulating cylinders 3, 3 is prepared by sealing air in a transparent sheet. The solar heat soil sterilization system is further characterized by burying heat-heating pipes 10, 10 in the soil 5 to be heat-sterilized in a prescribed depth, disposing a boiler 12 for heating a heating medium, and circulating the heating medium in the boiler 12 and the heat-releasing pipes 10.