A jumper cable device, comprising an input port, two clamps, a main controller, a clamp polarity detection module and a clamp connection module. The input port is configured to be connected to a startup power source. The clamps are configured to be connected to a battery of a load. The clamp polarity detection module and the clamp connection module are connected to the main controller and the clamps. When the clamps are connected to the battery, the clamp polarity detection module detects polarities of electrodes of the battery to which the two clamps are connected, and the main controller acquires a detection result signal therefrom, control the clamp connection module according to the detection result signal to determine polarities of the two clamps according to the polarities of the electrodes of the battery and connect circuits between the input port and the two clamps to boost the battery.