The core equipment technology of three-machine and three-flow straight-arc continuous bending/straightening slab caster was introduced. The large-capacity T-type tundish, heavy-duty high-low rail tundish, slab inner and outer arc hydraulic vibration device and L-shaped vertical sector transmission device have been developed. Five years of production practice has proved the reliability and stability of three-flow slab continuous casting technology, and realized the reasonable matching of production rhythm of large-scale smelting furnace, continuous casting and hot rolled strip steel. It can increase the output of a single casting machine to 3 million tons, thereby reducing the number of casting machines, thus reducing the infrastructure investment and subsequent production consumption of the steel mill. A new continuous casting model is developed to realize the quasi-high efficiency of slab production, which accords with the trend of green and low carbon development of iron and steel industry.