An interspinous dynamic stabilization device, comprising: a main structure (1), a first fastener (2) and a second fastener (3) the main structure (1) consists of two symmetrical M-shaped elastic folded boards (11, 12) with respective openings opposite to each other the first fastener (2) consists of one pair of oppositely fastened plates (21, 22) fixed on one side of the two M-shaped elastic folded boards (11, 12) of the main structure (1) and is perpendicular to the direction of the openings of the M-shaped elastic folded boards (11, 12) the second fastener (3) consists of another pair of oppositely fastened plates (31, 32) fixed on another side of the two M-shaped elastic folded boards (11, 12) of the main structure (1), and is perpendicular to the direction of the openings of the M-shaped elastic folded boards(11, 12). The main structure (1) consisting of the two symmetrical M-shaped elastic folded boards (11, 12) with respective openings opposite to each other provides polyline-variation flexibility performance, able to maintain normal spine movement and restrict excessive spine movement. In other words, normal spine movement is maintained in the high-slope range and excessive spine movement is restricted in a low-slope range.Linvention concerne un dispositif de stabilisation dynamique interépineuse, comprenant : une structure principale (1), un premier organe de fixation (2) et un second organe de fixation (3) la structure principale (1) consiste en deux plaques pliées élastiques en forme de M, symétriques (11, 12) ayant des ouvertures respectives opposées lune à lautre le premier organe de fixation (2) consiste en une paire de plaques fixées de façon opposée (21, 22) fixées sur un côté des deux plaques pliées élastiques en forme de M (11, 12) de la structure principale (1) et est perpendiculaire à la direction des ouvertures des plaques pliées élastiques en forme de M (11, 12) le second organe de fixation (3) consiste en une autre paire de plaques fixées de
