The invention discloses a networked medium voltage narrow band power line carrier device based on carrier timing. The device comprises a main carrier device and a secondary carrier device. Both the main carrier device and the secondary carrier device are equipped with a microprocessor module and are equipped with a power supply module, a memory module, an interface module and a carrier analog circuit module which are connected with the microprocessor module. The microprocessor module of the main carrier device is loaded with a timing module, an authentication module, a message restructuring and parsing module, a carrier analog circuit control module, a channel occupation logic authorization module and a port logic mapping control module. The secondary carrier device is loaded with an authentication module, a message restructuring and parsing module, a carrier analog circuit control module and a port logic mapping control module. According to the networked medium voltage narrow band power line carrier device, modes of carrier timing, main and secondary carrier device authentication, channel occupation authorization and the like are employed, the improvement of the transmission efficiency of a medium voltage carrier network is realized through raising the carrier channel utilization rate, and an IP-used carrier network development trend is satisfied.