The invention discloses a high-speed post-forming system of an aseptic filling machine. The high-speed post-forming system solves the problem that in the case of existing high-speed forming equipment,the working efficiency is low, the forming effect is not good, and production and use of enterprises are not facilitated. The high-speed post-forming system comprises a package inlet sliding groove assembly, a package inlet mechanism, a conveyor chain assembly, a drive sprocket assembly, a package pressing power mechanism, a package pressing shaping mechanism, angle welding heating mechanisms, anangle welding forming mechanism, a package outlet mechanism and a chain way, the package inlet mechanism is installed on one side of the package inlet sliding groove assembly, the conveyor chain assembly is installed on one side of the package inlet mechanism, the drive sprocket assembly is installed inside one end of the conveyor chain assembly, the package pressing power mechanism is installedat the top end of the conveyor chain assembly, the angle welding heating mechanisms are installed on the two sides of the portion, close to one end, of the conveyor chain assembly, one end of the conveyor chain assembly is provided with the package outlet mechanism, the top end of the package outlet mechanism is provided with the angle welding forming mechanism, and the package outlet mechanism isconnected with the chain way. According to the high-speed post-forming system, the structure is novel, the concept is ingenious, the machining efficiency is high, the finished product quality is good, and production is facilitated.