Disclosed are a surgical suture (1), a suture device and a heart valve or blood vessel suture device. The surgical suture (1) comprises a flattening portion (12), the ratio of the length of the flattening portion (12) to that of the surgical suture (1) is greater than 0.5, the flattening portion (12) is provided with two flattening surfaces (121), which are oppositely arranged, the two sides of the two flattening surfaces (121) are respectively connected through two arc surfaces (122), the ratio of the width to the thickness of the flattening portion (12) is between 1.4 and 1.98, and the thickness of the flattening portion (12) is equal to the distance between the two flattening surfaces (121). The surgical suture (1) facilitates the twisted or knotted fixing at the two ends of the surgical suture (1), makes the stress of suture tissue to the surgical suture (1) be more uniform, and reduces damage to muscle tissue and bone tissue； meanwhile, the surgical suture (1) relatively widens the contact surface with bone tissue, so that the friction force between the surgical suture (1) and the bone surface increases, and thereby reducing the risk of loosening of binding that may be easily caued by the surgical suture (1) slipping on the bone surface.L'invention concerne une suture chirurgicale (1), un dispositif de suture et un dispositif de suture de valvule cardiaque ou de vaisseau sanguin. La suture chirurgicale (1) comprend une partie d'aplatissement (12), le rapport de la longueur de la partie d'aplatissement (12) sur celle de la suture chirurgicale (1) est supérieur à 0,5, la partie d'aplatissement (12) est dotée de deux surfaces d'aplatissement (121) qui sont disposées de manière opposée, les deux côtés des deux surfaces d'aplatissement (121) sont respectivement reliés par deux surfaces d'arc (122), le rapport de la largeur sur l'épaisseur de la partie d'aplatissement (12) est compris entre 1,4 et 1,98, et l'épaisseur de la partie d'aplatissement (12) est égale à la
