Skin butt joint edge trimming precision scriber

The utility model discloses a precise scriber for trimming a butt joint edge of a skin. The precise scriber comprises a guiding rule, a scribing plate, a pointer, a scribing pen rack, a scribing pen, an aligning rule and a process base plate, the marking-off plate is placed on the process base plate, a marking-off pen through hole is formed in the marking-off plate, scale marks are arranged on the two sides of the upper surface of the marking-off plate, the pointer is placed on the marking-off plate, the pointer, the marking-off plate and the process base plate are tightly pressed and fixed to the guiding rule through the threaded pin, and the fastening piece is loosened. The marking-off plate can move front and back in the length direction of the guiding rule, a to-be-trimmed skin is placed below the marking-off plate, the marking-off pen sequentially penetrates through the marking-off pen rack and the marking-off plate to the upper surface of the to-be-trimmed skin, the turned-over edge of the guiding rule