The invention provides a warm-water-free silane crosslinking polyolefines composition, comprising base material A and catalyst parent material B, the weight ratio thereof being :100:4-6, wherein the base material A is composed of (by weight parts): polyolefine rsin 100 parts, first antioxidant 0.2-0.3 parts, silicane 2.0-4.0 parts, initiator 0.1-1.0 parts, lubricant 1.0-3.0 parts, fatty acid 0.1-0.5 parts, the catalyst parent material B is composed of (by weight parts): polyolefine resin 100 parts, second antioxidant 1.0-5.0 parts, catalyst 2.0-5.0 parts, ester compound 2.0-5.0 parts, metal oxide 2.0-5.0 parts. The preparation method is uniformly mixing the above material. The silane crosslinking polyolefines composition can be linkable under natural conditions not through boiling or vapor bathing, with property corresponding the operational requirement, especially silane crosslinking polyolefines cable material .