A diagonal compression bistable plate-type piezoelectric energy collection device comprises one or more than one rectangular plate piezoelectric energy collection unit, and a clamp configured to clamp the edge of the piezoelectric energy collection unit and provide centripetal compression force to the piezoelectric energy collection unit. The piezoelectric energy collection unit comprises a rectangular plate flexible rectangular plate and a flexible piezoelectric element applied to the surface of the flexible rectangular plate. Compared to the commonly employed axial direction compression single-layer bistable plate-type piezoelectric energy collection device, the diagonal compression bistable plate-type piezoelectric energy collection device can realize multidirectional regulation, and has wider frequency response range and higher output power; and moreover, the clamp is employed to perform centripetal compression force regulation at the flexible rectangular plate angular point, the flexible piezoelectric element applied to the surface of the flexible rectangular plate is more uniform so as to give full play to piezoelectric characteristics of piezoelectric materials and improve the generation efficiency.