Symmetrical divinyl ketones and divinyl ${alpha}$-diketones were synthesized in moderately good yields through palladium catalyzed carbonylative homocoupling reaction of vinylic halides. Divinyl ${alpha}$-diketones were obtained in the highest yield in the presence of 10 atm of carbon monoxide, using 2 mol% ligand added to palladium(II) acetate as catalyst and three equivalents of tributylamine as base in polar solvent at $100^{circ}C$. Divinyl ketones were synthesized mainly under atmospheric pressure of carbon monoxide. The reaction was also proceeded to several other vinylic halides under the above reaction condition. Thus, divinyl ketones and divinyl ${alpha}$-diketones were synthesized selectively as expected.