The pressure cooker is equipped with a safety valve and pressure limiting device, which can intelligently control the internal pressure to ensure the safety of the cooking process. Restriction of pressure to a certain pressure is automatically released. The pot cannot be opened without pressure relief. In the event of a blockage of the pressure limiting valve vent, steam is guaranteed to be discharged from the safety valve within a pressure range. Pressure relief window is the last guarantee of security when pressure limiting and safety valves fail. When the pressure continues to rise, the alarm valve will sound an alarm.