The invention discloses a flow distribution device which comprises a flow distributor which is of a concave structure, wherein by virtue of the concave structure, a flow distribution cavity having an opening is formed; the flow distributor is arranged inside a pressure container in a hung mode and is located just below a nuclear reactor core; the opening of the flow distributor faces the nuclear reactor core; a central hole is additionally formed in the center of the bottom of the flow distributor in a penetrating mode and is formed just below the nuclear reactor core; a plurality of shunt holes are additionally formed in the flow distributor in a penetrating mode; under the actions of the central hole and the shunt holes, coolant can uniformly and stably flow into the nuclear reactor core, and the coolant is effectively prevented from generating a vortex under the action of the central hole, so that the uniformity and the stability of coolant flow distribution are further improved; meanwhile, since the vortex is prevented from generating, the safety and the reliability of the nuclear reactor are guaranteed and the probability of nuclear safety accidents is reduced. In addition, the invention also discloses a nuclear reactor component with the flow distribution device.