A machine for the decoration of tridimensional products, including a basement, means for supporting the product to be decorated associated to the basement and a unit for decorating the product associated to the basement. The decoration unit includes a moveable arm rotatably associated to the basement, a plurality of print heads of the ink-jet type, provided with at least one head with ejector nozzles, sliding along the moveable arm. Each of the print heads is moveable from a non-operating position, in which it is spaced from the product, to an operating position in which it is in proximity of the surface of the product, to obtain a decoration.