The present invention relates to an LED flat lighting device which facilitates heat emission, while being used in a small and medium imaging device for taking a picture or an image, and which is also formed into a thin and small size. The LED flat lighting device includes an LED module which emits light toward the front side; a flat-shaped first housing which is spaced apart from the LED module so as to form a convection part for discharging heat generated from the LED module; a fixing member which couples the LED module and the first housing to each other; and a circuit board which controls the LED module and which is installed at the first housing spaced apart from the LED module so that the convection part is interposed therebetween.