The invention provides a cashmere yarn fast weaving device, and belongs to the field of cashmere yarn processing. The device includes an outside support, an electric rotating rod, a weaver, a supporting rod and a base, and is characterized in that the weaver is arranged at the center of the top end of the base, a secondary connecting plate is arranged at the center of the top of the weaver, a support is arranged on the portion, on the side of the weaver, of the top end of the base, a motor is arranged at the center of the top end of the support, the output end of the motor is provided with a rotating shaft through a coupler, the output end of the rotating shaft is provided with a service cap, the end, away from the rotating shaft, of the service cap extends into the weaver, the supportingrod is arranged inside the weaver at the end, away from the rotating shaft, of the service cap, a connecting plate is fixed to the interior of the weaver on the side, away from the service cap, of thesupporting rod, an outer connecting plate is arranged inside the weaver on the side, away from the supporting rod, of the connecting plate, the close ends of the outer connecting plate and the connecting plate are both hinged to a yarn feeding cylinder, and a yarn feeding roller is arranged on the inner wall of the weaver on the side, away from the supporting rod, of the yarn feeding cylinder.