The invention relates to a rapier clamping head for carbon fiber expanded flat filament weaving. The rapier clamping head comprises a lower fixing clamping head, an upper movable clamping head, a rotary shaft, springs, a control device and weft yarn, wherein the upper end of the lower fixing clamping head is provided with an oblique support rod for being connected with the upper movable clamping head. The upper movable clamping head comprises a movable arm and a servo arm which are fixedly connected in a certain angle. The joint between the movable arm and the servo arm is connected with the support rod through the rotary shaft. Besides, the movable arm can drive the servo arm to rotate around the rotary shaft. The vertical distance between the center of the rotary shaft and the clamping surface of the lower fixing clamping head is smaller than the length L of the servo arm. The rotary shaft is used for effectively clamping the yarn when the upper movable clamping head rotates. Clamping grooves corresponding to the springs are formed in the servo arm and the support rod respectively. According to the rapier clamping head for carbon fiber expanded flat filament weaving, the internalstructure of the clamping head is simplified, hence, the size of the clamping head can be reduced as much as possible, the size of an opening is reduced, damage to carbon fibers is reduced, and the production efficiency of a weaving machine is increased.