The invention provides moisture-preservation warp-knitting fabric. The moisture-preservation warp-knitting fabric comprises a moisture preservation layer and a surface layer, wherein the moisture preservation is formed by warp knitting of 150D moisture preservation yarn and 75D polyester filament, the surface layer is woven by flat polyester filament, and the surface layer and the moisture preservation layer are fixedly connected after being subjected to warp knitting. The moisture preservation yarn is formed by doubling 50S modified acrylic yarn and 50D polyester filament in a double-spiral structure. The modified acrylic yarn is formed by fixedly spinning 7D and 64MM modified acrylic fiber. The weight of the modified acrylic yarn accounts for 40-45% of that of the yarn of the moisture preservation layer. The moisture preservation yarn is formed by doubling the 50S modified acrylic yarn and the 50D polyester filament and is suitable for being woven, the moisture regain rate of the moisture preservation yarn reaches up to 18%, the strength can reach 5cN/dtex, during weaving, the yarn does not easily get broken, the weaving performance is stronger, thus defects of the fabric are reduced, and the waste of finished product of the fabric in use is reduced.