Disclosed are a Tibetan mastiff pile fabric and a weaving method thereof, which has the following steps: selecting pile from original Tibetan mastiff pile, combing the pile, washing the pile, adding oleine oil to proceed pile synthesizing weaving under the conditions that the proportion by weight of oil and water is 1:2-3, closing pile time is 18-20 hrs, the moisture regain of dehaired pile on a machine is 20-25%, and spinning drag multiple is 1.2-1.8, and then obtaining the Tibetan mastiff pile fabric through bobbin-winding, cabling and twisting. The Tibetan mastiff pile fabric should be kept in weakly-acidic environment with the pH value among 5-6 and drying temperature among 105-110 DEG C after the treatments of fulling, softening, and smoothing. The invention firstly employs Tibetan mastiff pile to weave fabric and adopts a technology which is applicable to the characters of the Tibetan mastiff pile, which fills the technical black of the Tibetan mastiff pile fabric. The product is characterized by light texture, soft, slippery and glutinous hand feeling, good thermal retention degree which is 2.1 times as much as cashmere, wide exploitation and application prospect, strong competitive power of Tibetan mastiff pile dress ornament in domestic and overseas markets, resisting pilling, resisting kneading, resisting friction and washing, and length, fineness, strength and elasticity of the fabric are much higher than the cashmere fabric.