Switching power supply filter circuit

The utility model discloses a switching power supply filter circuit. As for the switching power supply filter circuit, a current input end is provided with an inductor suppression circuit used for suppressing impacts of a surge current; a current transformation link is provided with a harmonic wave absorption circuit used for suppressing harmonic waves and other interference which are generated by an alternate current electric supply portion and a high and low voltage direct current transformation portion; and a current output end is provided with a low voltage high frequency filter circuit used for filtering the high frequency interference which is likely to occur and outputted to a power supply equipment object. In other words, interference suppression measures are taken at the input end, the output end and the transformation link of the switching power supply filter circuit, so that the entire switching power supply filter circuit can stay in a highly safe working environment, and thus a highly stable, rel