An external fixation device (1, 100, 200) for the treatment of bone fractures, comprising a first member (2, 102, 202), a second member (3, 103, 203), a central body (4, 104, 204), arranged between said first member (2, 102, 202) and said second member (3, 103, 203), a first ball joint (5, 105, 205) for the articulated joint of said first member ( 2, 102, 202) with said central body (4, 104, 204), a second ball joint (6, 106, 206) for the articulated joint of said second member (3, 103, 203) with said central body ( 4, 104, 204), locking means (11, 11 '； 111, 111'； 211, 211 ') operatively associated with said first ball joint (5, 105, 205) and said second ball joint (6, 106, 206), such that said locking means is designed to allow / prevent articulation of said first member (2, 102, 202) and said second member (3, 103, 203), respectively, with respect to said central body (4, 1 04, 204), so that said first member (2, 102, 202) comprises a first clamp (7, 107, 207), said second member (3, 103, 203) comprises a second clamp (8, 108, 208 ), and said central body (4, 104, 204) comprises a third clamp (9, 109, 209) for the attachment of said external fixation device (1, 100, 200) to the respective fractured bone parts that have been to be treated, in such a manner that said first clamp (7, 107, 207), said second clamp (8, 108, 208) and said third clamp (9, 109, 209) are suitable to accommodate pins or screws intended to secure the attachment of the fixing device (1, 100, 200) to the bone parts to be treated, said first clamp (7, 107, 207) is articulated to said third clamp (9, 109, 209) by means of said first ball joint (5, 105, 205) along at least three planes (10, 10 ', 10' ') orthogonal to each other, and said second clamp (8, 108, 208) is articulated at said third clamp (9, 109, 209) by means of said second ball joint (6, 106, 206), along at least three planes (10, 10 ', 10' ') orthogonal to each other, characterized by that said first clamp (7, 107, 207) is movably a
