The invention discloses a glass door plank machining method and system and provides a manufacturing technique of a frameless stainless steel glass door plank. The machining technique for manufacturing a frameless glass door plank through stainless steel and the 45-degree splicing manufacturing technique are achieved. The glass door plank machining method comprises the steps that S1, a stainless steel plate is cut, and a first plate, a second plate, a third plate and a fourth plate are obtained; S2, a first cutting method is conducted on the first plate, a first frame plate is obtained, and the first frame plate comprises a first board, a second board, a third board, a fourth board, a fifth board and a sixth board; S3, the fourth board, the fifth board and the sixth board of the first frame plate are punched; S4, dadoing is conducted on the first frame plate along connection lines; and S5, the first frame plate subjected to dadoing is bent perpendicularly along a dadoing line in the same direction, and a first frame strip is obtained.