Modularized scanning power supply system capable of outputting sectional type special current waveform

The invention discloses a modular scanning power supply system capable of outputting a sectional type special current waveform. The system comprises a preceding-stage adjustable voltage module, an upper computer, a power supply controller and an H-bridge power conversion module, the preceding-stage adjustable voltage module is used for receiving voltage provided by an alternating current input incoming line and outputting required voltage according to a voltage demand instruction of the power supply controller, and the upper computer is used for outputting the required voltage according to a user demand instruction. The upper computer is used for generating given waveforms or special segmented waveforms with different frequencies and amplitudes and outputting the given waveforms or the special segmented waveforms, the power supply controller is used for generating a pulse width modulation signal according to a user demand instruction and calculating a voltage demand instruction according to the waveforms outp