The invention discloses a novel reactor core inlet flow distribution apparatus which is arranged below a reactor core lower plate of a pressurized water reactor. The novel reactor core inlet flow distribution apparatus comprises an apparatus body, wherein the apparatus body is a semi-closed structure with the lower end being closed and the upper end being opened, the apparatus body has an outer wall of a consistent thickness, and the outer wall is provided with a plurality of drain holes (100); and the edge of the upper end opening of the apparatus body extends to form a flange part (11). Thenovel reactor core inlet flow distribution apparatus has the advantages of simplicity in installation, more equilibrium in flow distribution, and capability of reducing eddy current generation.