A system for wirelessly charging an electronic tag, comprising: a wireless power transmitting device configured to transmit device transmitting power in a wireless power transmission scheme; and an electronic tag configured to receive the power from the wireless power transmitting device in a wireless power transmission scheme so as to be charged and configured to display merchandise item information on a screen, wherein the electronic tag includes: a wireless power receiving unit configured to receive power in a wireless power transmission scheme; a battery configured to be charged with the power received from the wireless power receiving unit; a monitoring unit configured to monitor a power state of the battery; a display unit configured to display information on the power state of the battery from the monitoring unit on a screen; and a first wireless communications unit configured to wirelessly transmit the information on the power state of the battery from the monitoring unit together with tag identification information in a first wireless communications scheme, wherein the wireless power transmitting device includes: a power management unit configured to supply power to be wirelessly transmitted; and a wireless power transmitting unit configured to be electrically connected to the power management unit and be slidable along a tag holding rail so as to wirelessly transmit the power from the power management unit. a wireless power transmitting device configured to transmit device transmitting power in a wireless power transmission scheme; and an electronic tag configured to receive the power from the wireless power transmitting device in a wireless power transmission scheme so as to be charged and configured to display merchandise item information on a screen, wherein the electronic tag includes: a wireless power receiving unit configured to receive power in a wireless power transmission scheme; a battery configured to be charged with the power received from the wireless power receiving unit; a monitoring unit configured to monitor a power state of the battery; a display unit configured to display information on the power state of the battery from the monitoring unit on a screen; and a first wireless communications unit configured to wirelessly transmit the information on the power state of the battery from the monitoring unit together with tag identification information in a first wireless communications scheme, wherein the wireless power transmitting device includes: a power management unit configured to supply power to be wirelessly transmitted; and a wireless power receiving unit configured to receive power in a wireless power transmission scheme; a battery configured to be charged with the power received from the wireless power receiving unit; a monitoring unit configured to monitor a power state of the battery; a display unit configured to display information on the power state of the battery from the monitoring unit on a screen; and a first wireless communications unit configured to wirelessly transmit the information on the power state of the battery from the monitoring unit together with tag identification information in a first wireless communications scheme, wherein the wireless power transmitting device includes: a power management unit configured to supply power to be wirelessly transmitted; and a wireless power transmitting unit configured to be electrically connected to the power management unit and be slidable along a tag holding rail so as to wirelessly transmit the power from the power management unit.