The invention discloses a two-dimensional nano carbon heating body, and a flexible electric heating module and a preparation method therefor. The two-dimensional nano carbon heating body comprises at least a membrane-shaped electric heating structure, and at least two flexible electrodes, wherein the membrane-shaped electric heating structure comprises a porous structure mainly formed by multiple layers of two-dimensional carbon nanotube networks, and the porous structure is positioned in a plane corresponding to the membrane-shaped electric heating structure; the conductivity of the membrane-shaped electric heating structure in a chosen direction is higher than the conductivity of the membrane-shaped electric heating structure in other directions different from the chosen direction; the at least two flexible electrodes are arranged at intervals in a set direction, and electrically connected with the membrane-shaped electric heating structure. The two-dimensional nano carbon heating body does not need to be combined with a substrate, so that the two-dimensional nano carbon heating body has the characteristics of lightness, thinness, ventilation and the like, and large-area preparation can be realized; therefore, when the two-dimensional nano carbon heating body is used for preparing the flexible electric heating module, characteristics of convenient cutting and processing, still high electric/thermal conversion efficiency, rapid temperature rise, uniform heating, high radiating efficiency, excellent electric heating stability and the like are achieved; and therefore, the two-dimensional nano carbon heating body is applicable to manufacturing of wearable products.