Safety pressure cooker

The utility model belongs to a pressure vessel, particularly a safety device for a pressure cooker. The utility model has a primary safeguard structure that the centre of a cooker lid is fixed with a tubular exhaust nozzle. A pressure limiting valve is buckled on the exhaust nozzle, and the top part of an inner cavity of the pressure limiting valve is provided with a dredging rod which penetrates through the exhaust nozzle. The pressure limiting valve drives the dredging rod to do reciprocating motion in the exhaust nozzle in exhaust process. The utility model can effectively avoid stemming in the exhaust nozzle to bring about piling up and dryness until the phenomenon of clogging occurs. The utility model has the advantages of simple structure and good safety performance and can thoroughly prevent the clogging of the exhaust nozzle.