The invention discloses a dual-mode piezoelectric vibration power generation device. The dual-mode piezoelectric vibration power generation device comprises an L-shaped base, a T-type cantilever beam,a d33-mode piezoelectric crystal, a d31-mode piezoelectric sheet, an adjustable mass block, a mass press block, a substrate, shock isolation springs and four guide posts, wherein the d31-mode piezoelectric sheet is attached onto a near fixed end of a cantilever end, the adjustable mass block is connected to a part below a far fixed end of the cantilever end by a thread, one end of each of the four guide posts is in threaded connection with a bottom plate of the L-shaped base, the other ends of the four guide posts sequentially penetrates through elongate round through holes in four corners ofthe substrate, the mass press block and the adjustable mass block, and the shock isolation springs are arranged on the guide posts between the adjustable mass block and the mass press block and the guide posts between the substrate and the bottom plate of the L-shaped base. By the dual-mode piezoelectric vibration power generation device, energy collection under vertical stress in a d33 mode canbe achieved, energy collection under axial stress in the d31 mode also can be achieved, so that piezoelectric energy collection in various modes is achieved; and moreover, the dual-mode piezoelectricvibration power generation device is simple in structure, the adaptability of the device on an environment is improved, and higher power generation efficiency is achieved.