The invention relates to a high-resistance ground fault detection method based on zero-sequence current zero crossing point interruption discrimination and belongs to the field of protection and control of power systems. The method comprises the following steps of: acquiring a zero-sequence current instantaneous value of a monitored feeder line of a substation, calculating the time of the zero-sequence current less than a set value after the zero-sequence current is subjected to zero crossing, and determining that the zero crossing point interruption occurs and determining the fault to be a suspected high-resistance ground fault if the time exceeds a threshold; and determining that a steady-state high-resistance ground fault occurs if the duration of the suspected high-resistance ground fault exceeds the threshold. The method is applicable to a three-phase medium-voltage distribution system with neutral point grounded through resistance, and only a zero-sequence current signal is utilized; and compared with the conventional high-resistance ground fault detection methods, the method has high sensitivity.