Abstract: The infrared thermal imaging technology is widely used in SF₆ gas leakage detection, with advantages such as non-contact, strong intuitiveness, and fast response. However, traditional infrared imaging leak detectors cannot provide quantitative measurements. A gas leakage detection method based on dual-band infrared imaging is proposed in this study to realize the quantitative detection of non-contact infrared leakage imaging. The improved VIBE algorithm is used to locate the leakage gas cloud. Through the dual-band differential analysis between the gas absorption band and the non-absorption band, the SF₆ gas leakage is quantified. The results show that the differential detection can better eliminate the influence of background radiation at the gas leakage, the coefficient of determination between the result and the true value reaches 0.8, and the average error is 14.3%, which can realize the quantitative detection of 30ppm⋅m leakage. Compared with the traditional SF₆ gas infrared imaging leakage detection method, the dual-band infrared differential imaging method realizes the quantitative leakage detection while detecting the leakage position.