The invention relates to the ribbon technique and particularly relates to a production process of a 38mm telescopic belt for producing pet belts, pet traction ropes and wide-narrow ribbons for variousbox-bag lifting belts. The production process mainly comprises the following steps: (1) beam-warping, (2) debugging, (3) belt weaving and (4) quality inspection. The production process has the beneficial effects that produced products are low in error and high in precision, the widths of the belts are 38mm, the error is limited within +/-0.5mm, the length of elastic wrinkle parts are 12cm, the error is limited within +/-1mm, the length of non-elastic planar parts are 5cm, and the error is limited within +/-2mm; and the process design is reasonable, the quality of the products can be visuallyinspected, the yield of the products can be visually judged, and the process is simple and easy to implement.