The invention discloses a bidirectional energy collection apparatus based on flow-induced vibration, comprising a rigid wing panel, a rotating shaft and two sets of piezoelectric beams. The rigid wing panel and the rotating shaft are in connection through a non-linear torsion spring; the rotating shaft and a base are fixedly connected through the piezoelectric beams fixed in an L shape; when a incoming flow speed exceeds a structure critical speed, the rigid wing panel generates flow-induced vibration in pitching, rising/ sinking, and resistance directions, and meanwhile the piezoelectric beams can collect the bending mechanical energy in rising/ sinking, and resistance directions. Compared with the prior art, the apparatus additionally utilizes the structural resistance of periodical change in energy collection, and corresponding vibration mechanical energy to furthermore increase total electric energy output.