The Vertical Cylindrical Pressure Steam Sterilizer is installed with an electrical heater, a timer, an automatically pressure-temperature controller, a safety valve, a releasing valve, a pressure-temperature indicator, an alarm bell for finished sterilization and an instrument to automatically cut off the effective sterilization, convenient operation, safe, less electricity consuming and cheap. It is ideal equipment for clinics, scientific research institutes and other organizations to sterilizer surgical instruments, fabrics, glasses, culture media etc.