A field sequential color liquid crystal display (FSC-LCD) device and a color control method thereof are provided. The FSC-LCD device includes: a liquid crystal display panel which includes a color filter of first color sub-pixel and a color filter of second color sub-pixel, and a color field period thereof is sequentially divided into a first sub-color-field period and a second sub-color-field period; and a backlight module for providing a backlight source to the liquid crystal display panel and including a red backlight and a cyan backlight. The backlight module is for providing two color backlights respectively during a first backlighting period in the first sub-color-field period and a second backlighting period in the second sub-color-field period. The present FSC-LCD device has larger aperture ratio and higher transmittance, can achieve high color gamut display, and is easily to realize the narrow border design while reducing the amount of LED.