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, 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, 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; 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, 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, 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; 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.