The utility model discloses a product transfer chain, the utility model discloses a product transfer chain comprises multiunit alone operation's deflector roll driving medium, every group deflector roll drives the deflector roll by independent driving motor, and every group deflector roll driving medium all is equipped with the multiunit to be used for detecting on this guide rail driving medium the detection device of product volume in bags, through detecting on the guide rail driving medium section gap condition of product in bags, can make the speed operation of the deflector roll of every group roller driving medium with the difference, adopt the separately product in bags of overlapping of differential, in order to realize the product interval ground separation in bags of each bag, thereby product randomly arranged has in bags been solved among the prior art, the technical problem who overlaps each other, sufficient preparation has been makied in automatic letter sorting for the product.