The invention discloses a production process for a flame-retardant soft lining cloth for a garment. By weight, 20-70 parts of flame-retardant acrylic, 10-60 parts of bamboo charcoal fibers, 1-15 parts of tencel and 3-35 parts of flame-retardant viscose are weighed, then the flame-retardant acrylic, the bamboo charcoal fibers and the tencel are subjected to stretching, tatting and calender bonding, and therefore semi-finished lining cloth is obtained; the semi-finished lining cloth is soaked in a softener acid solution, wherein the soaking temperature ranges from 35 DEG C to 55 DEG C, the soaking time ranges from 30 min to 70 min, after being dried, the semi-finished lining cloth is placed on a coating machine to be coated, side cutting and length metering are conducted, then winding is conducted, and the lining cloth is obtained. The manufactured lining cloth for the garment is soft in hand feeling, the softness, the comfort and the excellent flame-retardant effect required by the lining cloth can be met at the same time, good breathability is achieved, and good moisture absorption is achieved; the lining cloth is light, thin, easy to wash and dry, simple in manufacturing process, cheap and fine, and cost is greatly reduced.