A wave power generator comprises a transmitting module and a piezoelectric generator, the transmitting module comprises a raft, a transmission member and a coupling member, the raft has a surface, and the transmission member is disposed at the first surface. The piezoelectric generator has a case and at least one piezoelectric module. The transmitting member has a vibrating portion. The coupling member comprises a rotating wheel and a crank rod, the rotating wheel is driven by the vibrating portion, and the crank rod is driven by the rotating wheel. The case comprises a second surface and at least one accommodating slot recessed into the second surface. The piezoelectric module is disposed into the accommodating slot and comprises at least one frame body, a moving member and a plurality of piezoelectric portions. The moving member is penetrated into the frame body and moved back and forth in the frame body.