The invention discloses a magnetic field vector sensor based on a large-angle tilting fiber grating. The magnetic field vector sensor comprises a broadband light source, a fiber circulator, a fiber rotating connector, a sensing probe and a spectrometer. According to the sensing probe, a 45-degree tilted fiber grating, a large-angle tilted fiber grating and a chirped fiber grating are orderly written on a single-mode fiber, a gate region of the large-angle tilted fiber grating is sleeved into a glass capillary tube, a magnetic fluid is injected, then package is performed, and the sensing probeis made. According to the invention, the refractive index sensitivity change and directional characteristics of the large-angle tilted fiber grating are used, combined with birefringent characteristics of the magnetic fluid, the intensity magnitude and direction of a magnetic field can be monitored at the same time, and the magnetic field vector sensor has the advantages of simple structure, easymanufacture and high sensitivity and precision and is less affected by external temperature.