The invention discloses an electric cable pay-off device which structurally comprises a partition plate, a connecting plate, a connecting rod, a rolling wheel, a drawing ring, a fixed frame, a fixed rod, a cable winding column, limiting partition plates, reinforcement ribs, a supporting frame and a movement assistance device. The upper surface of the partition plate is attached to the lower surface of the movement assistance device. According to the electric cable pay-off device, the movement assistance device is independently arranged on structure, the drawing ring is connected with a drawingrope of a construction work vehicle, the drawing ring is pulled to drive a drawing plate, the whole device is driven to be drawn to the work site through cooperation with the rolling wheel, and poweris turned on; when a cable needs to be paid off, a control switch is pressed, the whole device is powered on, a bearing and a rotor iron core are driven by a spindle to cut a magnetic field between the spindle and a stator iron core to bring larger power, the cable winding column is driven by the spindle to rotate to pay off the cable, and therefore the defects existing during take-up and pay-offare overcome; and manual pay-off is not needed, the whole device is more convenient to use, and the application range is widened.