The present invention discloses a super rapid exchanging method compound pulse current polarity changing arc welding power supply device used for electric arc welding, which comprises a DC power supply, a full bridge transfer circuit, a control system, a drive circuit, a parallel absorbing protecting circuit and a pulse current output circuit. The parallel absorbing protecting circuit is consists of an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. The pulse current output circuit consists of a second follow current inductance LP, a fifth power switch tube TP and a second power diode DP. The DC power supply comprises an assistant DC power supply, a first DC power supply and a second DC power supply. The first DC power supply is used for providing a background current, and the second DC power supply is used for supplying a peak current Tpp, and the control system adopts a DSP processor chip. The current ascension rate of the power supply equipment output polarity changing square wave current of the present invention is not less than 50A/Mus, and the rate of descent is not less than 50A/ Mus, and the current ascension rate of the compound pulse is not less than 50A/Mus, and the current ascension rate is 10 to 15 A/ Mus, and the frequency of the compound pulse is 1kHz to 30 kHz, and the duty ratio is 10 percent to 90 percent.