The invention provides a splicing sectional material for a heat insulation window frame. The splicing sectional material comprises a left mold cavity and a right mold cavity, a connecting rod is arranged on one side of the left mold cavity, and vertically-downward connecting teeth are evenly arranged at the lower end of the connecting rod on the left mold cavity. A lap joint groove is formed in the upper portion of the left mold cavity, and an installing clamping groove is formed in the lower side of the left mold cavity. A connecting rod is arranged on one side of the right mold cavity, vertically-upward connecting teeth are evenly arranged at the upper end of the connecting rod on the right mold cavity, a vertically-upward baffle is arranged on the upper portion of the other side of the right mold cavity, a wool top groove is formed in the top end of the baffle, a rubber strip groove is formed in the position below the wool top groove, and an installing clamping groove is formed in the lower side of the right mold cavity. The left mold cavity and the right mold cavity are combined in an inserted mode through the connecting teeth. According to the splicing sectional material for the heat insulation window frame, splicing of the window sectional material is more convenient, and the width of the window splicing sectional material can be adjusted according to the width of a window; and the splicing sectional material has the advantages of being simple in structure, convenient to maintain, low in machining cost and the like.