The invention relates to a correction method for a liquid crystal display screen array and provides a master control module, a liquid-crystal display array and a video source, wherein the master control module is electrically connected with the liquid-crystal display screen array and the video source. The correction method comprises the following steps: step (S1), replacing a liquid-crystal display screen into the liquid-crystal display screen array; step (S2), determining the working brightness of a backlight source of the newly-replaced liquid-crystal display screen according to prestored backlight brightness-time attenuation curve, the current working time of the liquid-crystal display screen array and the current brightness of the liquid-crystal display screen array; and step (S3), adjusting the brightness of the backlight source of the newly-replaced liquid-crystal display screen to the working brightness determined in the step (2). According to the correction method, the cost of hardware equipment is saved.