The invention provides an automatic deviation adjusting device of a pipe belt conveyor and relates to the technical field of conveying equipment. The automatic deviation adjusting device of the pipe belt conveyor comprises a supporting plate, a carrier roller unit and a deviation adjusting mechanism, wherein the supporting plate is provided with a pipe belt through hole; the carrier roller unit comprises a carrier roller assembly and a deviation adjusting roller assembly; the deviation adjusting mechanism comprises an adjusting seat and adjusting rods; the adjusting rods are connected with theadjusting seat and the deviation adjusting roller assembly; the adjusting seat is provided with a guide rail; the adjusting rods are slidably connected to the guide rail; the guide rail comprises a straight segment and deflective segments. The adjusting rods slide to the defective segments to drive the deviation adjusting roller assembly to deflect, the deviation adjusting roller assembly drivesa pipe belt to rotate back to a normal state. Carrier rollers are inclined under friction force between the pipe belt and the carrier rollers. Accordingly, automatic deviation adjustment is realized,and the automatic deviation adjusting device is simple in structure, low in cost and wide in application range.