Hair extension and manufacturing apparatus and method thereof

A hair extension, comprising:

• a hair extension fixing portion;
• and
• a hair extension body, wherein the hair extension body is connected to the hair extension fixing portion, the hair extension fixing portion further comprises a connecting hair strand layer, a second hair strand layer, a third hair strand layer, a fourth hair strand layer, two first stitching threads, a second stitching thread, and a third stitching thread, the connecting hair strand layer is connected to the hair extension body, the connecting hair strand layer, the second hair strand layer, the third hair strand layer, and the fourth hair strand layer form a stacked structure, the second hair strand layer is located between the connecting hair strand layer and the third hair strand layer, the third hair strand layer is located between the second hair strand layer and the fourth hair strand layer, the two first stitching threads are respectively used to stitch the connecting hair strand layer and the second hair strand layer, the two first stitching threads are disposed close to the hair extension body, the second stitching thread is used to stitch the third hair strand layer and the fourth hair strand layer, and the third stitching thread is used to stitch the connecting hair strand layer, the second hair strand layer, the third hair strand layer, and the fourth hair strand layer;
• wherein the hair extension fixing portion further comprises a first bent portion, the first bent portion is connected to the third hair strand layer and the fourth hair strand layer, and the first bent portion is close to the hair extension body.