The invention discloses a corrugated furnace pipe for a steam-gas boiler. A plurality of arc grooves are formed in the outer wall of the furnace pipe at equal intervals, the distance L1 between every two adjacent arc grooves is 1/15 to 1/20 of the furnace pipe length L, and the distance H between the bottom of each arc groove and the inner wall of an opening portion of the furnace pipe is not smaller than 16 cm. According to the corrugated furnace pipe, disturbance on smoke in the furnace pipe can be enhanced, and the radiant heat transfer area is enlarged; and meanwhile, the rigidity of the furnace pipe is improved, swelling stress of the furnace pipe is effectively reduced, the heat transfer effect is greatly enhanced, and combustion of fuel in the furnace pipe is promoted.