A manufacturing method of a tiling electronic device includes the following steps. A first electronic panel is provided. The first electronic panel includes multiple first bumps and multiple first conducting lines, and the first bumps and the first conducting lines are disposed on a side surface of the first electronic panel. A second electronic panel is provided. The second electronic panel includes multiple second bumps and multiple second conducting lines, and the second bumps and the second conducting lines are disposed on a side surface of the second electronic panel. The first electronic panel and the second electronic panel are coupled through the first bumps and the second bumps. Multiple conducting elements are formed, so that the first conducting lines are electrically connected with the second conducting lines through the conducting elements after the first electronic panel and the second electronic panel are coupled.