The invention provides a pellet ore pre-heating method, comprising the following steps: green pellets are sent into a drying grate to sequentially carry out primary drying, secondary drying, primary pre-heating and secondary pre-heating; the fume discharged by a rotary kiln is used as a hot air source when the secondary pre-heating is carried out; the fume discharged by the secondary cooling of acooler is used as the hot air source when the primary pre-heating is carried out; the fume discharged by the secondary pre-heating is used as the hot air source when the secondary drying is carried out; and the fume discharged by the tertiary cooling of the cooler is used as the hot air source when the primary drying is carried out, and the fume discharged by the tertiary cooling is heated to thepreset temperature when the primary drying is carried out. Compared with the prior art, in the invention, part of the fume passing the secondary cooling is mixed into the fume of the tertiary cooling,thus ensuring the fume of the tertiary cooling to satisfy the requirement of the primary drying so that the fume of the tertiary cooling can be totally recycled.