The metal boss is a load-bearing component of Type Ⅳ pressure vessels. It usually adopts an integrated skirt structure, where stress concentration occurs under lifting loads, reducing structural strength and service life. A skirt-notch structure for the metal boss was proposed to improve stress uniformity in the skirt region during lifting operations. First, theoretical formulas for the number, length, and width of the skirt notches were derived based on the basic dimensions of the boss, and the feasible parameter ranges were calculated under given conditions. Then, a finite element structural mechanics model of the type Ⅳ pressure vessel head section was established, and the Mises stress difference in the skirt region was used as the evaluation index for stress uniformity. Finally, single-factor tests and response surface methodology were combined to analyze and optimize the notch parameters. The results show that the Mises stress difference decreases first and then increases as the notch length, width, and number increase. The influence order is number > width > length. With the optimized parameters of a length of 7.8 mm, a width of 16.3 mm, and a number of 3, the Mises stress difference is reduced by 45.1% compared with the traditional boss, and the stress distribution becomes more uniform. The proposed skirt-notch structure effectively enhances the structural strength and service life of metal boss in type Ⅳ pressure vessels.