The invention provides a biomimetic fish-based flow-induced vibration energy collection device. The device comprises a base, a swing beam, a first tail stand column, a second tail stand column and a head stand column; the head stand column is arranged at the front end of the base, the first tail stand column and the second tail stand column are symmetrically arranged at the back end of the base, the top end of the first tail stand column and the top end of the second tail stand column are each provided with an amplification transducer, one end of the swing beam is fixed to the top end of the head stand column, the free end of the swing beam faces the two amplification transducers and is located between the two amplification transducers, the free end of the swing arm is provided with a beam-end permanent magnet, and wings are symmetrically arranged on the two sides of the swing arm. The device is novel and simple in structure and reasonable in design, bistable state offset is generated through magnetic force, water power is guided through the wings, conversion between water flowing and vibration is enhanced, vibration is converted into periodic magnetic force to act on the amplification transducers through the magnetic force, the higher electromechanical coupling coefficient is achieved, the energy density is increased, the reliability is high, insulating sealing is easy, and follow-up storage and usage of electric energy are promoted.