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The present invention discloses an intelligent thermal energy circulation device and a control method for improving sterilization, belonging to the technical field of drying devices supporting sterilization equipment. It includes a box body, a power unit, a heating unit, and a dehumidification unit. Each unit is connected through a circulation pipeline to form a hot air circulation closed loop; the power unit and the heating unit are arranged below the box body, and the dehumidification unit is arranged above the box body. The heating unit includes a ceramic resistance heating rod with an overheat temperature protector to achieve independent over-temperature protection; the dehumidification unit uses a laminated honeycomb water-cooled plate in combination with a heat dissipation fan to achieve efficient condensation dehumidification. The present invention realizes the recycling of thermal energy through a closed-loop hot air circulation, combines multiple safety protections and intelligent dehumidification control, solves the problems of thermal energy waste, incomplete dehumidification, poor heating safety, drying dead corners, and easy damage of the fan in existing drying equipment, significantly improves the drying efficiency and equipment reliability, and is applicable to the pre-treatment drying process of instruments for hydrogen peroxide low-temperature plasma sterilizers.