<p>A clock synchronization method in communication technology field includes: sending a clock synchronization request to a clock synchronization server through a cryptographic channel; and receiving a clock synchronization response from the clock synchronization server through the cryptographic channel. An access point clock synchronization device and system are further provided by the embodiment of the present invention. In the embodiment of the invention, by transferring the clock synchronization control signaling through cryptographic channel so that the clock synchronization control signaling is protected, and the security of the clock synchronization between the AP and the Clock Server is improved.</p>
