The invention relates to an explosion-proof junction box, and the explosion-proof junction box comprises a junction box cover, a wiring terminal, a grounding terminal, a junction box seat and a wire outlet component. A box body of the junction box seat is composed of four eccentric arcs, and a cover body of the junction box cover is composed of four eccentric arcs. The four eccentric arcs of the box seat are matched with the four eccentric arcs of the box cover. The eccentric distances between the centers of the four eccentric arcs of the box seat and the center of the junction box sat are M;eccentric distances between the centers of the four eccentric arcs of the box cover and the center of the junction box cover are N. The junction box seat is connected and fastened with a wire outlet base of a motor base through a first fastening bolt. The internal space is more spacious, and the junction box has the reasonable electrical clearance, creepage distance and shell strength, is higher in protection level, greatly improves the sealing performance, is more convenient for installation and application, is high in stability, is convenient to use, is compact in structure, and is beautifulin appearance.