The invention discloses an electric excavator with a cable winding device. The electric excavator comprises an upper vehicle frame, a lower vehicle frame, an operation mechanism, an executing system and a dynamical system, wherein the upper vehicle fame is connected to the upper part of the lower vehicle frame in a rotating manner; the operation mechanism is mounted on the upper vehicle frame; the executing system is mounted in front of the upper vehicle frame; the dynamical system comprises an electricity supplying system and a hydraulic system; the electricity supplying system comprises a cable winding device, a front bracket, a rear bracket and a via-hole electricity collecting ring; one side of the front bracket is fixedly connected to the rear part of the lower vehicle frame; the other side of the front bracket is hinged to the rear bracket; the cable winding device is mounted on the rear bracket; an electricity supplying cable mounted on the cable winding device is connected with the via-hole electricity collecting ring. The electric excavator disclosed by the invention has the benefits that: the working noise is small; no tail gas is emitted; the cable winding device can wind or unwind the cable with a certain degree of tension along with the movement of the excavator, and can be adapted to turn within a certain angle. The electric excavator can also be used for practical operation of practical field trainings.