Bending machine for sheet metal comprising: - a bending assembly including a tool holder crosspiece, which is movable and supports a set of bending tools (40, 41, 42, 43, 44) that are aligned, and mutually positionable, along a longitudinal first direction so as to form defined compositions (C1, C2, C3, C4) of bending tools, and moving means (5, 6) for moving said bending tools (40, 41, 42, 43, 44) along said tool holder crosspiece, said moving means (5, 6) comprising connecting means suitable to engage said bending tools (40, 41, 42, 43, 44), wherein said moving means (5, 6) comprises a first carriage movable along said crosspiece parallel to said first direction and provided with said connecting means arranged for coupling a defined bending tool (40, 41, 42, 43, 44) in a connection position so as to move at least said bending tool (40, 41, 42, 43, 44) along said first direction; - a tool holder magazine arranged adjacent to, and at the side of, said bending assembly to support and receive at least said set of bending tools (40, 41, 42, 43, 44) and comprising at least one supporting guide that is movable and positionable in a transfer position in which said supporting guide is aligned to said tool holder crosspiece so as to receive from, or release to, said tool holder crosspiece said set of bending tools (40, 41, 42, 43, 44); said machine being characterized in that said tool holder magazine comprises pulling means associated to said supporting guide and arranged to engage said bending tools (40, 41, 42, 43, 44) when the latter ones are aligned in said supporting guide, said moving means (4, 5) comprising said connecting means suitable to engage said bending tools (40, 41, 42, 43, 44) in order to move the latter ones along said tool holder crosspiece and to transfer said set of bending tools (40, 41, 42, 43, 44) from said tool holder crosspiece to said supporting guide and suitable to couple said pulling means so as to move, by means of the latter, said set of tools (40, 41, 42, 43, 44) from said supporting guide to said tool holder crosspiece, wherein said pulling means comprises a rod slidably connected to said supporting guide parallel to said first direction and comprising a first end, which is opposite and farther from said tool holder crosspiece and which is provided with an abutment element suitable to abut against the bending tool of said set of bending tools that is the outermost and farthest one from said tool holder crosspiece, and a second end which is nearer and more adjacent to said crosspiece and which is provided with a connecting element suitable to be engaged by said connecting means of said moving means (5, 6). - a bending assembly including a tool holder crosspiece, which is movable and supports a set of bending tools (40, 41, 42, 43, 44) that are aligned, and mutually positionable, along a longitudinal first direction so as to form defined compositions (C1, C2, C3, C4) of bending tools, and moving means (5, 6) for moving said bending tools (40, 41, 42, 43, 44) along said tool holder crosspiece, said moving means (5, 6) comprising connecting means suitable to engage said bending tools (40, 41, 42, 43, 44), wherein said moving means (5, 6) comprises a first carriage movable along said crosspiece parallel to said first direction and provided with said connecting means arranged for coupling a defined bending tool (40, 41, 42, 43, 44) in a connection position so as to move at least said bending tool (40, 41, 42, 43, 44) along said first direction; - a tool holder magazine arranged adjacent to, and at the side of, said bending assembly to support and receive at least said set of bending tools (40, 41, 42, 43, 44) and comprising at least one supporting guide that is movable and positionable in a transfer position in which said supporting guide is aligned to said tool holder crosspiece so as to receive from, or release to, said tool holder crosspiece said set of bending tools (40, 41, 42, 43, 44);