An intelligence-defined optical tunnel network system, comprising: a plurality of optical switch interconnect sub-systems (400a-400e), comprising a first optical switch interconnect sub-system and a second optical switch interconnect sub-system, and a plurality of optical add-drop sub-systems (200a-200e) connected to each other, characterized in that: the first optical switch interconnect sub-system and the second optical switch interconnect sub-system are connected to each of the plurality of optical add-drop sub-systems (200a-200e), wherein the first optical switch interconnect sub-system is adapted to transmit a corresponding first lateral transmission optical signal to the second optical switch interconnect sub-system through a first line and a corresponding second lateral transmission optical signal to the second optical switch interconnect sub-system through a second line, and wherein the second optical switch interconnect sub-system comprises: a failover sub-module, configured to output one of the first lateral transmission optical signal and the second lateral transmission optical signal in response to a selective signal; and a micro-control unit, configured to output the selective signal to the failover sub-module in order to control the failover sub-module to output the second lateral transmission optical signal, when signal intensity of the first lateral transmission optical signal is lower than a threshold value. a plurality of optical switch interconnect sub-systems (400a-400e), comprising a first optical switch interconnect sub-system and a second optical switch interconnect sub-system, and a plurality of optical add-drop sub-systems (200a-200e) connected to each other, characterized in that: the first optical switch interconnect sub-system and the second optical switch interconnect sub-system are connected to each of the plurality of optical add-drop sub-systems (200a-200e), wherein the first optical switch interconnect sub-system is adapted to transmit a corresponding first lateral transmission optical signal to the second optical switch interconnect sub-system through a first line and a corresponding second lateral transmission optical signal to the second optical switch interconnect sub-system through a second line, and wherein the second optical switch interconnect sub-system comprises: a failover sub-module, configured to output one of the first lateral transmission optical signal and the second lateral transmission optical signal in response to a selective signal; and a micro-control unit, configured to output the selective signal to the failover sub-module in order to control the failover sub-module to output the second lateral transmission optical signal, when signal intensity of the first lateral transmission optical signal is lower than a threshold value. the first optical switch interconnect sub-system and the second optical switch interconnect sub-system are connected to each of the plurality of optical add-drop sub-systems (200a-200e), wherein the first optical switch interconnect sub-system is adapted to transmit a corresponding first lateral transmission optical signal to the second optical switch interconnect sub-system through a first line and a corresponding second lateral transmission optical signal to the second optical switch interconnect sub-system through a second line, and wherein the second optical switch interconnect sub-system comprises: a failover sub-module, configured to output one of the first lateral transmission optical signal and the second lateral transmission optical signal in response to a selective signal; and a micro-control unit, configured to output the selective signal to the failover sub-module in order to control the failover sub-module to output the second lateral transmission optical signal, when signal intensity of the first lateral transmission optical signal is lower than a threshold value. a failover sub-module, configured to output one of the first lateral transmission optical signal and the second lateral transmission optical signal in response to a selective signal; and a micro-control unit, configured to output the selective signal to the failover sub-module in order to control the failover sub-module to output the second lateral transmission optical signal, when signal intensity of the first lateral transmission optical signal is lower than a threshold value.