The invention relates to a power generation device capable of collecting wind in many directions, which comprises a base, a power generation unit arranged in the base, a rotating unit and a wind collecting unit which is arranged on the base and surrounds the rotating unit, wherein the wind collecting unit comprises a plurality of vertical wind collecting plates which are arranged radially at intervals; the outer edges of two adjacent wind collecting plates are matched with each other to form a wind inlet, and the inner edges of two adjacent wind collecting plates are matched with each other toform a wind collecting port; and the rotating unit is provided with a rotating shaft and a plurality of vanes, wherein the rotating shaft can be driven to rotate by wind force to drive the power generation unit, and the vanes extend outwards from the rotating shaft. When the wind collecting unit is blown by wind force from different directions, the wind can be introduced from the wind inlet corresponding to the wind direction to collect the wind force, and thus, the vanes of the rotating unit can be continuously blown by the wind force to stabilize the benefit of wind power generation.