Back door inner board assembly of passenger vehicle

The invention discloses a back door inner board assembly of a passenger vehicle. The back door inner board assembly comprises a back door inner board. The middle of the back door inner board is of a V shape. The two sides of the V shape are formed by two reinforcing ribs. The left reinforcing rib extends to the left side of the back door inner board from the middle of the bottom side of the back door inner board and is connected with the left end of a beam. The right reinforcing rib extends to the right side of the back door inner board from the middle of the bottom side of the back door inner board and is connected with the right end of the beam. A triangular frame structure is formed by the beam and the two reinforcing ribs. According to the back door inner board assembly, the modality of a back door can be improved and the problems that the back door shakes and generates abnormal sound are solved.