The invention provides a vertical frame assembly sectional material of a casement window, and relates to the field of building materials. The vertical frame assembly sectional material comprises a vertical frame sectional material, a conversion frame sectional material and a line pressing sectional material. The right end of the vertical frame sectional material is connected with the conversion frame sectional material in an assembling mode; glass is assembled at the right end of the conversion frame sectional material through the line pressing sectional material; the vertical frame sectional material comprises a frame center plate, an upper fixing plate and a lower fixing plate, stretching leftwards, are arranged at the upper end and the lower end of the frame center plate respectively, right-angle bending edges which are bent inwards are arranged at the front end of the upper fixing plate and at the front end of the lower fixing plate, a glass baffle stretching rightwards is arranged at the upper end of the frame center plate, a clamping groove is formed in the front end of the glass baffle, and a line pressing clamping groove is formed in the lower portion of the right side of the flame center plate. The vertical frame assembly sectional material is simple in structure, reasonable in design, convenient to construct and install, safe and environmentally friendly to use, high in production efficiency, low in cost, good in sealing performance, low in noise and capable of being widely applied to aluminum alloy casements, and components are not prone to deformation.