Abstract: The invention relates to a cutting mold set of metal tubes, comprising of the following: a cutting mold unit that moves in relation to a lower mold unit is installed on one side of an upper mold unit, the upper mold unit is capable of moving in relation to a lower mold unit. On the cutting mold unit is installed a first mold block with a cutting hole, and on the lower mold unit is installed a second mold block with a through hole, the cutting hole and the through hole matching and communicating with each other. With the metal tube inserted inside the through hole and the cutting hole, when the upper mold unit and the cutting mold move toward the lower mold unit, the cutting hole and the through hole move in relation to each other to create a cutting force to cut the metal tube, thereby achieving the objectives of speedy and safe operation, enhancing safety in cutting operation, and reducing waste iron scraps.