The invention discloses an automotive chassis suspension arm molding technology which comprises the following steps of (1) blanking, (2) positioning hole punching, (3) semicircle cutting on the end face, (4) flanging, (5) edge rolling, (6) shaping, (7) welding, (8) semicircle cutting, (9) cutting again, (10) punching, (11) end face milling, and (12) manual burr removal. A suspension arm obtained through the above molding technology only needs welding one time, repeated welding is not needed, the labor amount of machining persons is greatly reduced, and meanwhile, the using quality of the suspension arm is improved.