Automatic dispenser of product items and of goods comprising at least one automatic positioning system of selected items and at least one delivering device of the items, said automatic positioning system being adapted to position the selected items near said delivering device of the items at a level which can be easily reached and without impact caused by fall, said delivering device comprising at least one motored door sliding at least between an open position and a closed position, said automatic dispenser further comprising guiding means of said door, characterized in that said guiding means being shaped so that said door closes at least one opening of said delivering device by squashing deformable means to insulate and protect said automatic dispenser with respect to outside, wherein: - said guiding means comprise at least one first section adapted to match said door with said opening, in order to squash said deformable means along a contour of said opening, at least one second section adapted to separate said door from said opening, in order not to squash said deformable means, at least one third section adapted to gradually connect said at least one first and said at least one second section, said guiding means allowing said door to slide, avoiding a slipping of said deformable means and to squash said deformable means only next to said opening in order to avoid a slipping wear; and - said automatic positioning system comprises at least one blocking anti-theft device to block the automatic positioning system at a pre-established level to allow the delivery of the items avoiding the chance of a forced movement of said automatic positioning system during the delivery of the selected items, said blocking device comprising at least one motored rod (31, 32) adapted to translate by means of a cam actuator at least between a closed position and an open position, being placed, in its closed state, in recesses obtained on at least one support (2, 3) to block said automatic positioning system at a pre-established level to allow the delivery of the items, inhibiting a forced movement of said automatic positioning system during the delivery of the selected items. - said guiding means comprise at least one first section adapted to match said door with said opening, in order to squash said deformable means along a contour of said opening, at least one second section adapted to separate said door from said opening, in order not to squash said deformable means, at least one third section adapted to gradually connect said at least one first and said at least one second section, said guiding means allowing said door to slide, avoiding a slipping of said deformable means and to squash said deformable means only next to said opening in order to avoid a slipping wear; and - said automatic positioning system comprises at least one blocking anti-theft device to block the automatic positioning system at a pre-established level to allow the delivery of the items avoiding the chance of a forced movement of said automatic positioning system during the delivery of the selected items, said blocking device comprising at least one motored rod (31, 32) adapted to translate by means of a cam actuator at least between a closed position and an open position, being placed, in its closed state, in recesses obtained on at least one support (2, 3) to block said automatic positioning system at a pre-established level to allow the delivery of the items, inhibiting a forced movement of said automatic positioning system during the delivery of the selected items.