To improve environmental adaptability and reliability of piezoelectric harvester，a magnetically coupled piezoelectric vibration energy harvester（PVEH）based on a combined transducer is proposed in this paper. The PVEH is mainly composed of a coupler subjected to longitudinal vibration and a combined transducer subjected to transverse oscillation. The finite element model of the combined transducer and magnetic force is established using the COMSOL software，and the simulation analysis is carried out. Thus，the influence of the reed length ratio，thickness ratio and magnetic distance of the combined transducer on the PVEH performance is obtained through the simulation. On this basis，an optimal structural parameter（length ratio of 0.57 and thickness ratio of 2）is chosen to make the prototype and the characteristic experiments are performed. The experimental results shows the influence of the transverse distance Lx，longitudinal distance Ly，vertical distance Lz of the exciting magnet and the excited magnet on the PVEH performance. When the excitation frequency f is less than 20 Hz，there are two natural frequencies（denoted as fn1 and fn2 respectively，fn1