Disclosed is a blood flow speed measurement device, comprising a light source (101) and a detection module (105) respectively connected to one end of a beam splitter (102), a reference arm module and a sample arm module respectively connected to the other end of the beam splitter (102), and a processing module (106) connected to the detection module (105). Light output by the light source (101) is provided to the sample arm module and the reference arm module via the beam splitter (102). The sample arm module comprises at least one lens and also comprises an optical path rotating and reflecting module (108). The optical path rotating and reflecting module (108) rotates the split light beam to the sample arm module by 0-360 degrees and transmits the rotated light beam to an object to be detected via at least one lens. The beam splitter (102) receives the light scattered by the sample arm module and interferes with the light reflected back by the reference arm module. The detection module (105) is used for detecting interference light. The processing module (106) is for obtaining at least one blood flow speed component, which corresponds to the rotation angle, of at least one blood vessel of the object to be detected according to the interference light, and for obtaining an absolute blood flow speed of at least one blood vessel of the object to be detected according to the at least one blood flow speed component. The device can accurately measure the flow speed of the blood in a simple and convenient manner without knowing the included angle between a scan light beam and the flow direction of the blood.Linvention concerne un dispositif de mesure de la vitesse découlement du sang qui comprend une source de lumière (101) et un module de détection (105) respectivement raccordés à une extrémité dun séparateur de faisceau (102), un module de bras de référence et un module de bras déchantillon respectivement raccordés à lautre extrémité du séparateur de faisceau (102), et u
