In this study, a rapid cooling system for injection mold using liquefied gas was fabricated, and its performance was verified. CO₂ was selected as the refrigerant of the cooling system considering the convenience and maintenance fee. The system operated by spraying CO₂ directly into the cooling area using a capillary tube made of stainless steel. The performance of the fabricated system was verified using a square plate specimen. Subsequently, this result was reflected to a specimen injection mold, and a temperature sensor was installed and compared in two areas where fast and general cooling were performed. The effect of the rapid cooling system was quantitatively analyzed. The temperature results confirmed that rapid cooling was faster than general cooling.