The invention discloses an auxiliary mechanism for sewing a double jetted pocket zipper. The auxiliary mechanism comprises a bottom plate, a limiting cylinder, a first folding cylinder and a second folding cylinder. The limiting cylinder is arranged on the bottom plate, used for allowing zipper tape to pass through and used for limiting the zipper tape. The first folding cylinder is gradually curled and folded from one end to the other end and used for curling and folding a first cut part and a second cut part. The second folding cylinder is gradually curled and folded from one end to the other end and used for curling and folding another first cut part and another second cut part. The first folding cylinder and the second folding cylinder are both arranged on the bottom plate. The folding outlet of the first folding cylinder and the folding outlet of the second folding cylinder are both located above the limiting outlet of the limiting cylinder and partly overlapped on the limiting outlet. The auxiliary mechanism saves time and labor.