A palletizing device (10) comprising a lower plane (15) able to supportingly receive a pallet (5) and a loading device (100) vertically mobile above the lower plane (15) and comprising an upper platform (110), superposed in plan view on the lower plane (15) and provided with variable-configuration support means (112) and activating means able to cyclically move the support means (112) between a closed configuration, in which the define a support for a first layer of products (4) to be palletized, and an open configuration, in which they remove the support in order to release the first layer of products (4) downwards, in which the loading device (100) comprises a storing platform (120) defining a support for a second layer of products (4) to be palletized and flanked to the upper platform (110).