The utility model provides an ice melting auxiliary device with a negative impedance characteristic. The device comprises single capacitors, and more than two single capacitors are arranged. All single capacitors are connected in parallel. Each single capacitor is connected in series with a switching device. All single capacitors and switching devices form a main capacitor. According to the utility model, the single capacitors and the switching devices are combined and are connected in parallel to form the main capacitor; by changing the operation of the switching devices, the number of the single capacitors connected in parallel is changed; the capacity and the size of the output capacitance XC of the main capacitor are adjusted; the energy of an ice melting power supply is fully used; the length of an ice melting line is expanded; and the work efficiency of ice melting is improved.