The invention discloses a door and window sectional material cutting machine. The machine comprises an operation platform, a positioning device, a pushing device, a cutting device, an edge grinding device and a cleaning device; the positioning device comprises a first positioning plate, a second positioning plate, an inclined mechanism, a fixing rod, a reset mechanism, a positioning and moving mechanism, a pressing air cylinder and a pressing rod; the pushing device comprises a pushing plate, a pushing and moving mechanism and a transverse pushing mechanism; the cutting device comprises a cutting driving mechanism, a cutting lifting mechanism, a cutting wheel and a protective shell; the edge grinding device comprises an edge grinding stone, an edge grinding height adjusting mechanism and an edge grinding moving mechanism; and the cleaning device comprises a spray head, a water pipe and an up-and-down swinging mechanism. The machine has the beneficial effects of having the performance of being relatively high in efficiency and relatively good in effect.