The present invention relates to an electric excavator system, which comprises a power box including a plurality of control buttons for converting an external power source into a charging voltage, a cable drum provided to wind or unwind a transmission cable, A cable guide connected to the power box and guided so that the charging cable wound around the cable drum is not tangled or twisted, and a length detector for detecting the lead-out length of the cable of the cable drum, And a transmission unit configured to transmit the detected electric wire to the power receiving unit when the detected electric wire has a length of a maximum or minimum withdrawal length; A battery for charging electric power obtained by regenerative braking of the supplied electric power and the electric power generator and a battery connector for connecting and disconnecting the cable of the power supply unit and a motor generator and a controller, An overcharge preventing unit for preventing overcharging; a charge amount detecting unit connected to the battery and detecting a potential difference of the battery and outputting to a controller; an inverter connected to the battery and supplying the DC power of the battery to the alternator under the control of the controller, An alarm unit connected to the controller for sending an alarm when the detection potential of the battery is lower than the reference potential, a controller for outputting the alarm or stopping the operation after receiving the maximum or minimum withdrawal signal of the wire transmitted by the transmission unit of the power supply unit And an electric excavator having a power receiving unit composed of a receiving unit.According to the present invention, the power supply unit and the power reception unit can be separated and combined, thereby eliminating the restriction of the work space, improving the working efficiency, reducing the fuel cost, and performing the operation within the maximum or minimum draw-It is possible to obtain an effect of improving work safety.
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