The invention is applicable to the field of wireless communication technology, and provides a boundary security detection method and a boundary security detection system. The method includes the following steps: encryption and decryption operation is carried out on the operation boundary of a device to be detected; information which is returned after the encryption and decryption operation is detected; when the returned information meets a preset rule, boundary operation is determined to be secure. The invention can detect the security of the operation of the device to be detected (such as a card reader or a NFC (Near Field Communication) intelligent card) on the operation boundary.