A lock communication system for a shared bicycle, comprising a lock controller disposable on the shared bicycle and a server , the lock controller including a main control module and a network module , the main control module being configured to control a periodic heartbeat of the network module , and maintain a constant connection between the network module and the server , wherein the lock controller further includes a power supply and a short message module which are connected to the main control module , characterized in that , (S11) the main control module is further configured to obtain electricity from the power supply , and enter a power saving mode when the electricity quantity left in the power supply is lower than a preset threshold, or otherwise enter a normal mode; and wherein, (S12) in the normal mode, the main control module is further configured to turn on a heartbeat mode of the network module , obtain unlocking information of the server via the network module , and report unlocking confirmation information to the server via the network module ; (S13) in the power saving mode, the main control module is further configured to turn off the heartbeat mode of the network module , wherein the network module is configured to disconnect from the server when the main control module turns off the heartbeat mode of the network module ; the server includes a short message gateway , and the server is configured to automatically send, after the network module disconnects from the server , via the short message gateway , the unlocking information in form of a short message to the short message module of the lock controller, and the lock controller is configured to obtain the unlocking information of the server via the short message module , to activate the network module and to report the unlocking confirmation information to the server via the network module . characterized in that , (S11) the main control module is further configured to obtain electricity from the power supply , and enter a power saving mode when the electricity quantity left in the power supply is lower than a preset threshold, or otherwise enter a normal mode; and wherein, (S12) in the normal mode, the main control module is further configured to turn on a heartbeat mode of the network module , obtain unlocking information of the server via the network module , and report unlocking confirmation information to the server via the network module ; (S13) in the power saving mode, the main control module is further configured to turn off the heartbeat mode of the network module , wherein the network module is configured to disconnect from the server when the main control module turns off the heartbeat mode of the network module ; the server includes a short message gateway , and the server is configured to automatically send, after the network module disconnects from the server , via the short message gateway , the unlocking information in form of a short message to the short message module of the lock controller, and the lock controller is configured to obtain the unlocking information of the server via the short message module , to activate the network module and to report the unlocking confirmation information to the server via the network module . <EOS>