The invention relates to a floating, fishlike and raft-type liquid-metal magnetohydrodynamic wave energy direct power generating device which mainly comprises a front float, a rear float, a hinge, a liquid-metal magnetohydrodynamic (LMMHD) generator, a mooring system, and the like. The power generating device has a floating structure and can be arranged at different sea areas according to requirements; an adopted fishlike raft-type wave energy acquisition device can absorb the wave energy better and simultaneously has stronger storm resisting capacity; and the power generating device adopts aliquid-metal magnetohydrodynamic direct power generating technology, has less intermediate conversion links and improves the whole conversion efficiency.