The invention discloses a butt joint method for an intermediate shaft system and belongs to the field of machine assembly. The butt joint method comprises the steps that multiple technology pins are provided; a first intermediate shaft and an adjusting ring are coaxially connected together; first ends of all the technology pins are inserted into reaming holes of the adjusting ring until the firstends of all the technology pins penetrate out reaming holes of the first intermediate shaft; a second intermediate shaft abuts against the adjusting ring, and all reaming holes of the second intermediate shaft correspond to all the reaming holes of the adjusting ring; the first ends of all the technology pins are pushed, and thus second ends of all the technology pins penetrate the reaming holes of the second intermediate shaft; all the technology pins are sequentially removed from the corresponding reaming holes, and when one technology pin is removed each time, reaming bolts are inserted into the corresponding reaming holes; junction identifications are printed on the connecting portions of the first intermediate shaft, the second intermediate shaft and the adjusting ring; and serial numbers are sequentially printed on the corresponding reaming bolts and the reaming holes. The butt joint method achieves assembly of the intermediate shaft system.