Method for straightening elongated metal elements, in particular metal rods, comprising the steps of: a. arranging, at least for one said element, a straightening assembly (10, 100) along a supply line, comprising a frame carrying a first roller and a second roller, respectively rotatable around a first axis and a second axis, which are mutually parallel and spaced so as to define between said first roller and said second roller a passage for at least said element on a plane orthogonal to said first axis and said second axis, the method being characterized in that said frame is operable in a rotary motion about a rotation axis parallel to said first axis and to said second axis, at least between an inserting angular configuration for inserting said element along said supply line, wherein said first roller and said second roller are arranged opposite each other with respect to said supply line and said passage defined between said first roller and said second roller is aligned with said supply line for the insertion of said element, and at least one straightening angular configuration, wherein said first roller and said second roller are both on the same side, at least partially, with respect to said supply line, so as to arrange said passage along a sinuous path predisposed for straightening said element; and in that it comprises the further steps of: b. positioning said straightening assembly (10, 100) into said inserting angular configuration, actuating said frame in said rotary motion and inserting said element along said supply line through said straightening assembly in said inserting configuration; c. engaging said inserted element; d. positioning said straightening assembly (10, 100) into said straightening angular configuration, and feeding said element along said supply line, so as to straighten said element. a. arranging, at least for one said element, a straightening assembly (10, 100) along a supply line, comprising a frame carrying a first roller and a second roller, respectively rotatable around a first axis and a second axis, which are mutually parallel and spaced so as to define between said first roller and said second roller a passage for at least said element on a plane orthogonal to said first axis and said second axis, the method being characterized in that said frame is operable in a rotary motion about a rotation axis parallel to said first axis and to said second axis, at least between an inserting angular configuration for inserting said element along said supply line, wherein said first roller and said second roller are arranged opposite each other with respect to said supply line and said passage defined between said first roller and said second roller is aligned with said supply line for the insertion of said element, and at least one straightening angular configuration, wherein said first roller and said second roller are both on the same side, at least partially, with respect to said supply line, so as to arrange said passage along a sinuous path predisposed for straightening said element; and in that it comprises the further steps of: b. positioning said straightening assembly (10, 100) into said inserting angular configuration, actuating said frame in said rotary motion and inserting said element along said supply line through said straightening assembly in said inserting configuration; c. engaging said inserted element; d. positioning said straightening assembly (10, 100) into said straightening angular configuration, and feeding said element along said supply line, so as to straighten said element. the method being characterized in that said frame is operable in a rotary motion about a rotation axis parallel to said first axis and to said second axis, at least between an inserting angular configuration for inserting said element along said supply line, wherein said first roller and said second roller are arranged opposite each other with respect to said supply line and said passage defined between said first roller and said second roller is aligned with said supply line for the insertion of said element, and at least one straightening angular configuration, wherein said first roller and said second roller are both on the same side, at least partially, with respect to said supply line, so as to arrange said passage along a sinuous path predisposed for straightening said element; and in that it comprises the further steps of: b. positioning said straightening assembly (10, 100) into said inserting angular configuration, actuating said frame in said rotary motion and inserting said element along said supply line through said straightening assembly in said inserting configuration; c. engaging said inserted element; d. positioning said straightening assembly (10, 100) into said straightening angular configuration, and feeding said element along said supply line, so as to straighten said element. b. positioning said straightening assembly (10, 100) into said inserting angular configuration, actuating said frame in said rotary motion and inserting said element along said supply line through said straightening assembly in said inserting configuration; c. engaging said inserted element; d. positioning said straightening assembly (10, 100) into said straightening angular configuration, and feeding said element along said supply line, so as to straighten said element.