The invention discloses a double-way heating desulfurization ash spiral conveyor. The double-way heating desulfurization ash spiral conveyor comprises a split shell, a spiral hollow shaft and an outershell extension section; the spiral hollow shaft is mounted in the split shell, and the two ends are connected with the split shell through sealing bearing bases; the spiral hollow shaft positioned in the split shell is connected with a corrugated pipe coupling; the split shell is provided with the outer shell extension section; end sealing fillers and bearings are arranged between the sealing bearing bases and the spiral hollow shaft; and the front end of the spiral hollow shaft is connected with a driving device. One way of hot air carrier in the use process enters a hot air carrier jacketcavity from a back end intake port, and flows out from a front end exhaust port for peripheral heating of the outer side of the shell; and the other way of hot air enters the spiral hollow shaft froma back end rotating end, and is exhausted from a front end rotating joint for heating of the internal of the shell, so that the hot air carrier directly performs double-way heating on desulfurizationash from inner and outer directions, and the double-way heating desulfurization ash spiral conveyor achieves a spiral conveying function and a preheating heating function during operating.