three-blade interface saw for sanitary ware materials three tungsten carbide alloy saw blades comprise combined cutting tool. Tenon port can be milled correctlly on sanitary ware or curtain wall through once cutting stroke. The milling cutter can be adjusted at up-down direction and anterior-poster dircetion according to the needed size of tenon port. The vertical blade can be half increased for use in notch and cut off. Therefore, the processing scope is wider. The suitability is wide and productivity is high.