The invention relates to a closed submerged arc furnace coal gas dry-process purifying and recycling system which comprises a closed submerged arc furnace 1, an air natural cooler 3, a bag filter 4, a water-cooled type condensation drainer 5, a coal gas draught fan 6, a coal gas cabinet 7 and an automatic control system 11. The closed submerged arc furnace 1, the air natural cooler 3, the bag filter 4, the water-cooled type condensation drainer 5, the coal gas draught fan 6 and the coal gas cabinet 7 are sequentially connected through carbon steel pipes. The connecting pipeline between the closed submerged arc furnace 1 and the air natural cooler 3 and the connecting pipeline between the coal gas draught fan 6 and the coal gas cabinet 7 are provided with switching valves 2. A furnace cover of the closed submerged arc furnace 1 is provided with a furnace pressure measuring device 10. The automatic control system 11 is connected with the devices and the valves through signal lines. The dust content of coal gas purified through the system is smaller than 10 mg/m<3>, and investment and running energy consumption are low; the water content of the recycled coal gas is low, and the heating value is high; no waste water problem or sludge problem exists, and no corrosion, blockage, freeze or other running faults exist; furnace pressure is controlled accurately, and running is safely and reliably conducted in place; occupied area is small, and technical transformation is facilitated.