The invention discloses a short-process casting-forging integrated technology for steel. The short-process casting-forging integrated technology for the steel comprises the steps of precise steel ingot liquid core rate analog calculating, liquid core steel ingot smelting and casting, riser water sealing, high-temperature hot delivery demolding and steel ingot liquid core forging. According to theshort-process casting-forging integrated technology for the steel, a traditional technology method that heating and forging are conducted after steel ingots are completely solidified is broken through, the technology process is simplified, the processes of steel ingot cooling, annealing and heating before forging are omitted, the forge piece heating number is decreased, the solidification processand the deformation process are organically combined, semi-solid-state forging forming is conducted when the steel ingots are not completely solidified and have liquid cores, and then the short-process casting-forging integrated technology for the steel ingots is achieved; the advantages of a computer simulation and digitalization technology are fully utilized, computer analog calculation in the steel ingot casting-forging whole process is achieved, the liquid core rate is precisely controlled, riser cooling and shell solidifying are accelerated by adopting a special technology, and a novel ultrahigh-temperature demolding, hot delivering and liquid core forging technology for the steel ingots is achieved; and an effective novel way for eliminating shrinkage cavity loose of the steel ingotsand improving segregation and structure refinement is provided.