Surface acoustic wave (SAW) vector magnetic field sensors demonstrate considerable potential for a range of applications, given their ability to respond with high directionality to the direction of the magnetic field in space. However, single-pass sensors are afflicted with issues such as response randomness and low reliability, which restrict their deployment in precise magnetic field measurements. In response to the need for high-sensitivity SAW magnetic field sensors for the detection of space vector magnetic fields, this study proposes a highly sensitive SAW vector magnetic field sensor and a two-dimensional dual-path orthogonal structure. The sensor employs a planar semiconductor process to deposit a metallic aluminum transducer on an ST-90°X quartz substrate, thereby forming a delay line structure. Additionally, an anisotropic CoFeB magneto-sensitive thin film is incorporated into the acoustic propagation path through magnetron sputtering. The experimental results demonstrate that the designed 200 MHz SAW magnetic field sensor exhibits a phase response sensitivity of 55.214（°）/Oe when the SAW propagation direction is perpendicular to the applied magnetic field. Furthermore, the directional phase response exhibits a notable difference under different directional magnetic fields, and the sensor demonstrates good repeatability and stability. The two-dimensional dual-path orthogonal structure preserves the high sensitivity characteristics of the single-path element, offering a novel approach to achieve high-precision two-dimensional all-plane magnetic field detection.