The invention provides a multi-arm coupled collision piezoelectric energy collection device and is intended to solve the technical problem that an existing piezoelectric energy collection device has low energy collection efficiency; the multi-arm coupled collision piezoelectric energy collection device comprises an outer frame, piezoelectric vibrators, a first base, a simple pendulum structure, a first magnet and a second magnet; the piezoelectric vibrators at least include a first piezoelectric vibrator and a second piezoelectric vibrator, the bottom ends of the vibrators are fixed to the first base and may generate high mutual coupling upon resonance, the simple pendulum structure comprises a second base, a link, a rocker and a striker ball, the bottom end of the link is fixed to the second base, the top end of the link is movably connected with the upper end of the rocker, the striker ball is fixed to the lower end of the rocker, and the striker ball may collide with the free end of the first piezoelectric vibrator or second piezoelectric vibrator while rocking, the first base and the second base are fixed to the bottom of the outer frame, the side of the outer frame close to the simple pendulum structure is fixedly provided with the first magnet, and the top of the outer frame close to the piezoelectric vibrators is fixedly provided with the second magnet. The multi-arm coupled collision piezoelectric energy collection device has effectively improved energy collection efficiency.