A detachable backlight module of LCD TV comprises a casing with a detaching opening, a screen disposed in the front section of the casing, a detachable lamp rack disposed behind the screen and corresponding to the detaching opening, and a main circuit board disposed behind the detachable lamp rack; the main circuit board drives an illumination unit on the detachable lamp rack to evenly diffuse the light produced by the illumination unit through the screen to a plane light source and the detachable lamp rack can be detached from the detachable opening easily, and the foregoing constitute the detachable backlight module of a LCD television.