A press for vacuum vibro-compression of slabs or blocks or articles of agglomerated or ceramic material comprises a ram with a pressing surface configured for generating a vibratory movement, so as to comprise a first and a second set of vibrating devices, each device being provided with at least one rotating shall with an eccentric mass. The shafts of the vibrating devices of one set rotate in the opposite direction to the shafts of the vibrating devices of the other set. Each set comprises at least two vibrating devices which are arranged with their respective axes not coaxial and interconnected by kinematic connection for rotating in synchronism.