Unit for moving and accumulating sachets (S), comprising: - a feed plane on which a plurality of groups of sachets (S) is fed, by means of a feed device , from an entry zone (I) of said feed plane to an exit zone (O) of said feed plane parallel to a direction of feed (Z), said groups of sachets (S) being organized in rows, parallel to each other, and extending transversely with respect to said direction of feed (Z), said unit for moving and accumulating sachets (S) comprising a sorting device disposed in such a position as to receive said groups of sachets (S) from the exit zone (O) of said feed plane and being provided with: - support means , configured to support one or more groups of sachets (S), being vertically mobile between a plurality of operative positions, of which at least one initial operative position in which said support means are located at a vertical height not higher than that of said feed plane in order to receive said one or more groups of sachets (S), and - contrast means disposed above said support means being vertically mobile with respect to said support means , and in a coordinated manner therewith, in order to abut said groups of sachets (S), disposed on said support means , so that said groups of sachets (S) are kept at least partly enclosed, with respect to two different opposite sides, respectively by said support means and by said contrast means ; said movement and accumulation unit being characterized in that it comprises mobile abutment means configured to abut said groups of sachets (S), gradually stacked on said sorting device , in the direction of feed (Z), on the opposite side with respect to the side where said feed plane is disposed, said mobile abutment means being provided with an actuator configured to move said mobile abutment means between an operative abutment position, in which they prevent the displacement of said groups of sachets (S) in the direction of feed (Z), and an inactive position, in which they allow the movement of the groups of sachets (S) in the direction of feed (Z), wherein the mobile abutment means are mobile relative to the support means . - a feed plane on which a plurality of groups of sachets (S) is fed, by means of a feed device , from an entry zone (I) of said feed plane to an exit zone (O) of said feed plane parallel to a direction of feed (Z), said groups of sachets (S) being organized in rows, parallel to each other, and extending transversely with respect to said direction of feed (Z), - support means , configured to support one or more groups of sachets (S), being vertically mobile between a plurality of operative positions, of which at least one initial operative position in which said support means are located at a vertical height not higher than that of said feed plane in order to receive said one or more groups of sachets (S), and - contrast means disposed above said support means being vertically mobile with respect to said support means , and in a coordinated manner therewith, in order to abut said groups of sachets (S), disposed on said support means , so that said groups of sachets (S) are kept at least partly enclosed, with respect to two different opposite sides, respectively by said support means and by said contrast means ; <EOS>