The invention discloses a drawing and tailoring method for a women's swallow-tailed coat. The method comprises drawing and tailoring of a rear garment piece, a front garment piece, intensive side pieces and sleeve pieces according to a garment size. The drawing of the rear garment piece comprises drawing of a rear garment piece neckline, a rear garment piece dorsal middle curve, a rear garment piece slit, a rear garment piece dorsal width, a rear garment piece waist width, a rear shoulder offset line, a rear garment piece princess seam and a lower hem structure. The drawing of the front garment piece comprises drawing of a shawl collar, a lower bevel angle structure in a garment length direction, a shoulder offset line, an upper armhole curve and a front garment piece princess seam. The structure of each sleeve piece is divided into a large sleeve structure and a small sleeve structure, wherein the sleeve body structures of the large sleeve structure and the small sleeve structure are the same, the sleeve top structures of the large sleeve structure and the small sleeve structure are different, a sleeve top of the large sleeve structure is of a protruding structure, and a sleeve top of the small sleeve structure is of a concave structure. According to the method, an offset line drawing method is adopted for the front and rear garment pieces, so a tailoring structure is simplified.