The invention discloses a production system for low-cost and high-quality unidirectional warp knitted fabric. The production system adopts a multi-axial warp knitting machine, wherein a weft yarn needle holder group comprises standard needle holders, type A needle holders and type B needle holders, the holders are in consistent width, and X needles are arranged on each of the three kinds of needle holders; the standard needle holders and the type A needle holders as well as the standard needle holders and the type B needle holders are arranged on two sides of a weft laying area respectively, and the standard needle holders and the type B needle holders are arranged at intervals according to the weft laying width; the standard needle holders and the type A needle holders are arranged at intervals according to the weft laying width after rotating for 180 degrees; the same kind of needle holders is arranged in each weft laying width. With adoption of the production system, high-quality unidirectional fabric can be produced only by making cost-controllable change on the conventional multi-axial warp knitting machine, and the system operates reliably.