The invention provides a multidirectional broadband piezoelectric vibration power generation device comprising a first cantilever beam and a second cantilever beam; one end of the first cantilever beam is fixedly arranged and the other end of the first cantilever beam is detachably connected with one end of the second cantilever beam; the other end of the second cantilever beam is a free end and is provided with a mass; an included angle exists between the first cantilever beam and the second cantilever beam; and the first cantilever beam and the second cantilever beam are both provided piezoelectric patches, so that the multidirectional broadband piezoelectric vibration power generation device can collect vibration energy in many directions and convert the vibration energy into electric energy; a energy collection frequency band can be effectively broadened; and the collection efficiency of the vibration energy is raised.