The invention provides a harmonic suppression analog device and an analog method thereof. The harmonic suppression analog device comprises a waveform selecting and generating device, a governance device, a display device and a scene analog device, wherein the waveform selecting and generating device is used for generating standard sine-wave current waveform and harmonic current waveform of an equipment type set by a user; the scene analog device is used for simulating a scene in which a transformer substation and/or electric equipment change/changes under the condition of inputting standard sine-wave current waveform and harmonic current waveform; the governance device is used for generating and outputting compensating current waveform according to the harmonic current waveform, the compensating current waveform is integrated with the harmonic current waveform to form the standard sine-wave current waveform. The harmonic suppression analog device is used for stimulating the scene in which the transformer substation and/or electric equipment change/changes differently under the standard sine-wave current waveform and harmonic current waveform, and convenient for guiding a user to know damages of harmonic current waveform of various types of equipment to the transformer substation and/or the electric equipment as well as an existing adopted governance technology.