Window and screen integrated mullion frame

The utility model discloses a window screen integrated mullion frame, a mullion assembly connected with a conversion frame (5) and an opening window (6), the mullion assembly comprises a first mullion (1), a second mullion (2) and a mullion heat insulation strip (3), and the first mullion (1) is fixedly connected with the second mullion (2) through the mullion heat insulation strip (3); two pairs of mullion clamping parts of the first mullion are further arranged on the side edge, close to the mullion heat insulation strip, of the first mullion (1), a plurality of conversion frame connecting parts are arranged on one side edge of the first mullion (1) in the length direction, and a plurality of mullion buckling strip connecting parts of the first mullion are arranged on the other side edge of the first mullion (1) in the length direction. One side of the first mullion (1) is connected with a mullion buckle strip (4) through a mullion buckle strip connecting part; two pairs of mullion clamping parts of the sec