The invention relates to a heat dissipation explosion-proof device. The heat dissipation explosion-proof device comprises a turned pipe; one end of the pipe communicates with a furnace chamber channel; the other end of the pipe communicates with a smoke discharge channel; an explosion-proof port is formed in the pipe; an explosion-proof cover is arranged at the upper end of the explosion-proof port; elastic devices are arranged on the two sides of the explosion-proof port; the lower ends of the two elastic devices are fixedly connected with the pipe; the upper ends of the elastic devices are fixedly connected with the explosion-proof cover; a sealing ring is arranged at the upper end edge of the explosion-proof port; a first magnetic ring is arranged on an outer ring of the sealing ring; the explosion-proof cover is provided with a second magnetic ring; the second magnetic ring is positioned on the corresponding upper side of the first magnetic ring; the pipe is provided with a heat dissipation plate; a magnet is arranged in the heat dissipation plate; and the heat dissipation plate is magnetically sucked on the pipe through the magnet. Compared with the prior art, the heat dissipation explosion-proof device is simple in structure and stable in operation; a smelting furnace can be automatically closed to achieve good tightness; and the heat dissipation plate can dissipate heatin the explosion-proof port to reduce the burst probability of the explosion-proof cover.