The invention discloses a non-characteristic subharmonic circulating current suppression method, device and system. The method comprises the following steps: carrying out simulated analysis on a plurality of converters in parallel operation; determining whether a non-characteristic subharmonic current appears in output currents of the plurality of converters or not; and if the non-characteristic subharmonic current appears in the output currents of the plurality of converters, filtering out the non-characteristic subharmonic current in the output currents through high-pass filters. Through simulated analysis on parallel operation of the plurality of converters, the scheme of suppressing the non-characteristic subharmonic circulating current by adding the high-pass filters at the outlets of the converters is provided; the problem of the non-characteristic subharmonic circulating current in the parallel operation of the plurality of converters is solved under the condition of not affecting the performance of the converters; and the parallel operation reliability of various converter devices is improved.