Method for folding metal profiles in bars, comprising the steps of: a. feeding a predetermined number of bars and a supplementary predetermined number of bars, aligned on a feeding line; b. prearranging a first folding bench (10, 100) at one side of said feeding line, comprising a first fold unit (11, 110) carrying a folding head; c. prearranging a supplementary folding bench (20, 200) at one side of said feeding line, comprising a supplementary fold unit (21, 210) carrying a respective folding head, said first fold unit (11, 110) and said supplementary fold unit (21, 210) being aligned along a longitudinal direction parallel and placed at one side of said feeding line; d. prearranging an intermediate group (12, 22, 120) for double handling, suitable to engage at the same time through first handling means portions of said predetermined number of bars and through second handling means portions of said predetermined supplementary number of bars, being said intermediate group (12, 22, 120) interposed mobile with relative motion, relatively to said first fold unit (11, 110) and to said supplementary fold unit (21, 210), along said longitudinal direction; e. positioning along said longitudinal direction said first fold unit (11, 110) according to said relative motion, relatively to said intermediate group (12, 22, 120), so as to receive, interposed, said predetermined number of bars; f. positioning along said longitudinal direction said supplementary fold unit (21, 210) according to said relative motion, relatively to said intermediate group (22, 120), so as to receive, interposed, said supplementary predetermined number of bars; g. transferring from said feeding line said predetermined number of bars to said first folding bench (10, 100), engaging opposed ends of said transferred bars, through said intermediate group (12, 120) and said first fold unit (11, 110); h. transferring from said feeding line said supplementary predetermined number of bars to said supplementary folding bench (20, 200), engaging opposed ends of said transferred bars, through said intermediate group (12, 120) and said supplementary fold unit (21, 210); i. performing the folding of said predetermined number of bars through said first fold unit (11, 110) and at the same time performing the folding of said supplementary predetermined number of bars through said supplementary fold unit (21, 210). a. feeding a predetermined number of bars and a supplementary predetermined number of bars, aligned on a feeding line; b. prearranging a first folding bench (10, 100) at one side of said feeding line, comprising a first fold unit (11, 110) carrying a folding head; c. prearranging a supplementary folding bench (20, 200) at one side of said feeding line, comprising a supplementary fold unit (21, 210) carrying a respective folding head, said first fold unit (11, 110) and said supplementary fold unit (21, 210) being aligned along a longitudinal direction parallel and placed at one side of said feeding line; d. prearranging an intermediate group (12, 22, 120) for double handling, suitable to engage at the same time through first handling means portions of said predetermined number of bars and through second handling means portions of said predetermined supplementary number of bars, being said intermediate group (12, 22, 120) interposed mobile with relative motion, relatively to said first fold unit (11, 110) and to said supplementary fold unit (21, 210), along said longitudinal direction; e. positioning along said longitudinal direction said first fold unit (11, 110) according to said relative motion, relatively to said intermediate group (12, 22, 120), so as to receive, interposed, said predetermined number of bars; f. positioning along said longitudinal direction said supplementary fold unit (21, 210) according to said relative motion, relatively to said intermediate group (22, 120), so as to receive, interposed, said supplementary predetermined number of bars; g. transferring from said feeding line said predetermined number of bars to said first folding bench (10, 100), engaging opposed ends of said transferred bars, through said intermediate group (12, 120) and said first fold unit (11, 110); h. transferring from said feeding line said supplementary predetermined number of bars to said supplementary folding bench (20, 200), engaging opposed ends of said transferred bars, through said intermediate group (12, 120) and said supplementary fold unit (21, 210); i. performing the folding of said predetermined number of bars through said first fold unit (11, 110) and at the same time performing the folding of said supplementary predetermined number of bars through said supplementary fold unit (21, 210).