The present invention relates to an optical-based blood flow measurement system capable of monitoring the opening of an anastomosed vessel, and more particularly, to a vascular anastomosis apparatus (100) disposed at an anastomotic vessel site. A blood flow rate detecting sensor 200 integrally coupled to the vascular athletic apparatus 100 for detecting blood flow around the anastomosed blood vessel region； And a blood flow monitoring device 300 that receives information on blood flow measured by the blood flow detecting sensor 200 and monitors the blood flow amounts, wherein the blood flow detecting sensor 200 detects an amount of light And non-invasively detects the blood flow quantities. In addition, the present invention relates to an optical-based blood flow measuring method capable of monitoring the opening of an anastomosed blood vessel, and more particularly, )； (2) combining (S312) a second vascular graft device at a second end of the blood vessel； (3) binding the first vascular anastomosing device and the second vascular anastomosing device, and mating the cut blood vessels (S313)； (4) measuring (S315) the first blood flow volume before the anastomosed region and the second blood flow volume after the anastomotic region from the first vascular anastomosis apparatus and the second vascular anastomosis apparatus； And (5) wirelessly transmitting the measured first blood flow rate and the second blood flow rate to the monitoring device (S317). According to the optical-based blood flow measuring method and the optical-based blood flow measuring system using the optical-based blood flow measuring method, which are capable of monitoring the opening of the anastomosed blood vessel proposed in the present invention, A blood flow rate sensor for detecting blood flow around the anastomosed blood vessel, a blood flow rate monitoring device for monitoring the blood flow rate by receiving the blood flow rate information measured by the blood flow rate sensor, The sensor
