Credibility verifying method of hot plug device

The invention provides a credibility verifying method of a hot plug device. After an embedded type system is turned on and powered on and a local encrypted device database is decrypted, recognizing codes of the inserted hot plug device are obtained to be matched with a device database to be verified, if the recognizing codes pass verification, the system login operation is executed and the inserted hot plug device is allowed to be automatically mounted after the device database is encrypted, and otherwise the system login operation is refused to be executed; after login is successful, when a hardware replacement credibility verifying module monitors that the hot plug device is inserted at the moment in real time, the local encrypted device database is decrypted, the recognizing codes of the currently-inserted hot plug device are obtained to be matched with the device database to be verified, if the recognizing codes pass verification, the currently-inserted hot plug device is allowed to be automatically mounted after the device database is encrypted, and otherwise the currently-inserted hot plug device is refused to be mounted. By means of the method, the embedded type system can be effectively protected, and a hardware device is prevented from being illegally replaced.