Three-dimensional flow velocity sensor

The invention discloses a three-dimensional flow velocity sensor, which is characterized by being provided with a horizontal force measuring unit, a vertical force measuring unit and a fixed supporting rack, wherein in the horizontal force measuring unit, a horizontal force transmission mechanism consists of an outer ring body and an inner ring body which are coaxial and are spaced, the outer ring body and the inner ring body are connected via two groups of elastic beams arranged in axial symmetry, and each elastic beam is used as a horizontal force sensing unit; in the vertical force measuring unit, a central flat plate positioned at the central area of the inner ring body is used as a vertical force transmission mechanism, and the central flat plate and the inner ring body are coaxially arranged with a gap; and the fixed supporting rack is arranged along a radial direction. The invention has simple structure, works reliably and can realize the measurement of three-dimensional flow velocity.