Safety access method for sensor, sensor and safety access system

The embodiment of the invention discloses a safety access method for a sensor. The method comprises the following steps: when monitoring that service software calls service of the sensor, intercepting the service calling of the service software; acquiring a signature configuration file of the service software, wherein the signature configuration file comprises a program file and a signature ciphertext; calling a code signing certificate in the sensor to authenticate and sign the signature configuration file; and when the signature configuration file is authenticated and signed successfully, calling the service of the sensor through the service software. Correspondingly, the embodiment of the invention also provides a sensor, an application equipment terminal of the sensor and a safety access system. The implementation of the safety access method can realize the safety access management of sensor equipment, and avoids potential safety hazard caused by calling the sensor by various malicious software or a Trojan program.