Provided is a floating wind power generation device comprising: a main buoyant body which has buoyancy, so as to float on the sea, and has a space portion provided in the center; an auxiliary buoyant body which has buoyancy and is connected to the main buoyancy and is connected to the main buoyant body by being inserted into the space portion of the main buoyant body; a plurality of wind power generators which are vertically provided on top of the auxiliary buoyant body and generate power; a location control means which is connected to the main buoyant body and controls the location of the main buoyant body; an oscillation inhibiting means which is connected to the main buoyant body and enables the main buoyant body to maintain an equilibrium state by absorbing the sea waves; and a dock connection unit which is connected to the main buoyant body and enables a ship to lie at anchor on the sea. A floating wind power generation device, having a plurality of wind power generators provided on top of an auxiliary buoyant body that is placed in a space portion of a main buoyant body, enables absorbing of the sea waves by means of vertical reciprocating motion energy, generated by means of an oscillation inhibiting means as well as a location control means, so as to prevent the main buoyant body from being affected by the waves and shaking and such that an equilibrium state of the main buoyant body can be maintained, thereby enabling stable wind power generation.