Abstract: Considering the Security influencers such as strong electric field, transient electric shock, steady-state electric shock and electrostatic induction in the live device environment of substation, minimum approach distance as an important indicator of risk protection is crucial to ensure the safe and stable operation of electrical equipment and the safety of personnel life. Therefore, this paper proposes a method for detecting the approach distance between the substation workers and the live equipment based on binocular stereo matching and scene element recognition. This method first obtains the spatial information of the operation scene by the multi-stage binocular stereoscopic matching model based on the channel attention module, and then distinguishes between people and live equipment through the efficient identification model of the substation scene elements, and then calculates the space surface center of the element based on the spatial information and recognition results, and finally calculates the approach distance of the personnel based on the space surface center, so as to realize the real-time high-precision distance detection between the personnel and the live equipment... The actual data show that the proposed method realizes the real-time accurate measurement of approach distance between workers and the live equipment.