Provided are a method and a system for manufacturing a liquid crystal display device, which can reduce warping of a liquid crystal panel by bonding optical films alternately to the first and second panel surfaces of the liquid crystal panel, in which the method includes: feeding carrier films from continuous rolls, respectively; and bonding steps including bonding optical films, which are peeled off or being peeled off from the carrier films, to the first and second panel surfaces of a liquid crystal panel, respectively, wherein in the bonding steps, bonding the optical film to the first panel surface of the liquid crystal panel and bonding the optical film to the second panel surface of the liquid crystal panel are performed alternately.