A combination lock system includes a mobile communication device (10, 10′), a cloud server (20) and a combination lock (30, 30′). When the cloud server (20) determines that the mobile communication device (10, 10′) matches authentication information, the cloud server (20) outputs password information (22) corresponding to the authentication information to the mobile communication device (10, 10′), and the combination lock (30, 30′) obtains an electric energy and the password information (22) from the mobile communication device (10, 10′). When the combination lock (30, 30′) determines that one of the characters of the password setting module (31, 31′) matches one of the characters of the password information (22) corresponding to a corresponding arrangement order, the mobile communication device (10, 10′) displays display information.