The invention discloses an electronic handwriting apparatus and a handwriting display system of the electronic handwriting apparatus. The electronic handwriting apparatus is electrically connected to an electronic display apparatus, and comprises: at least one color setting button, each outputting a color setting signal; a first control unit electrically connected to each of the color setting buttons, receiving an output color setting signal and outputting a color selection signal according to the output color setting signal; the electronic display apparatus storing a plurality of color display information, selecting, according to the color selection signal, color display information corresponding to the color selection signal from the plurality of color display information, and setting the display information as current handwriting color when the handwriting apparatus performs handwriting input on the display apparatus.