The present invention refers to a cracking-shelling mechanism with variable eccentric adjustment for shelled fruits, that comprises a plurality of longitudinal blocks parallel among them, consisting of a couple of first elongated bars with recesses on its internal sides and, adjacent to said first elongated bars, at least one second elongated bar, which exhibits recesses on its internal sides, forming holes when the first and second elongated bars are confrontedly arranged. Each couple of first elongated bars is connected by means of a lever, in its turn connected to a connecting rod, to an eccentric rotation shaft. The lever is connected to a fastening means at a support point and the support means comprises displacement means that change its position with respect of the fastening means, in such a way that the first elongated bars run is adjusted, jointly, with respect of the second elongated bar.