A spiral-flow type flue gas fly ash sampling pipe is characterized by comprising an exhaust pipe, a sampling pipe, spiral-flow air inlet pipes and a sealing support box, wherein the sampling pipe comprises a straight pipe section and a cone pipe section, the diameter of the cone pipe section gradually decreases from top to bottom, the diameter of the spiral-flow air inlet pipes gradually decreasesfrom the front end to the rear end, the rear ends of the spiral-flow air inlet pipes tangentially communicate with the side wall of the straight pipe section of the sampling pipe, the spiral-flow airinlet pipes are vertical to the pipe wall of the straight pipe section of the sampling pipe, sampling nozzles are installed at the front end ports of the spiral-flow air inlet pipes; the exhaust pipeis L-shaped, and the longer pipe section thereof is installed in the straight pipe section of the sampling pipe; an ash collecting bottle is arranged in the sealing support box, and the lower end ofthe cone pipe section of the sampling pipe is deeply inserted in the sealing support box and connected to the ash collecting bottle. The device is simple in structure, and easy to operate, facilitatessampling, and meanwhile, ensures the accuracy of sampling detection due to multi-channel sampling.