PROBLEM TO BE SOLVED: To provide a culture soil production system which is easy to operate and has high sterilization capability.SOLUTION: A culture soil production system 1 is a system for producing culture soil by use of chaff discharged in threshing. The culture soil production system 1 includes: a pulverization device 200 for grinding the chaff into a granular state; a sterilization device 300 for thermally sterilizing the granulated chaff by electric heat, while stirring the chaff; and a culture soil forming device 400 for clumping powder included in the thermally sterilized granular chaff to form the culture soil.
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