A thin LCD device includes an LCD panel with fixing holes; a fixed plate with two opposite sides covering two opposite sides of the LCD panel and having through holes corresponsive to the fixing holes of the LCD panel respectively; a main board fixed to the fixed plate and the fixed plate being installed between the main board and the LCD panel; a housing shielding the main board and covering sides of the LCD panel and the fixed plate and having through holes corresponsive to the through holes of the fixed plate and the fixing holes of the LCD panel; and a fixing element passing through the respective through hole of the housing, the respective through hole of the fixed plate and the respective fixing hole of the LCD panel to fix the housing, the fixed plate and the LCD panel, so as to facilitate assembling and reduce thickness.