The invention discloses a rectangular glass cutting machine tool. The rectangular glass cutting machine tool comprises an operating platform; a lifting device is arranged on the upper end face of theoperating platform; the lifting device comprises supporting blocks which are in a bilateral symmetrical manner and are fixedly arranged on the upper end face of the operating platform; a fixing plateis fixedly arranged at the upper ends of the left side supporting block and the right side supporting block; a fixing block with the lower end extending outwards is fixedly arranged in the upper end face of the center of the fixing plate; a slideway with an upward opening is formed in the upper end surface of the fixing block; a size adjusting device is arranged below the fixing plate; a cutting device is arranged below the lifting device. According to the rectangular glass cutting machine tool, limiting blocks of the rectangular glass cutting machine tool can be flexibly adjusted according toactual needs, then the size of cut rectangular glass is adjusted, the application range of the machine tool is wider, practicability is higher, a large amount of equipment cost is saved for enterprises, economic benefits of the enterprises are improved, and higher possibility is provided for expanding and increasing the yield of the enterprises.