In order to join wrought magnesium alloy AZ31B plates, an Al matrix filler metal was developed to join them by means of high-frequency induction brazing. The microstructure and phase constitution of the brazed joint were investigated by scanning electron microscopy, X-ray diffraction and X-ray energy dispersive spectroscopy. The mechanical properties and microhardness of the brazed joint were also tested. The results show that the single Mg32(Al,Zn)49 phase in the original filler metal is consumed after the soldering process; moreover, α-Mg solid solution and β-Mg17(Al,Zn)12 phase are formed in brazing region due to the intensive alloying between the molten filler metal and the base metal in the process of brazing. The average tensile strength of the butted joint is 71 MPa and the average shearing strength of the overlapped joint is 44 MPa. The fracture surface of the brazed joint exhibits an intergranular fracture feature and the crack originates from the hard β-Mg17(Al,Zn)12 phase