Abstract: A robust partial nitrification process includes using a partial nitrification reactor, an operation control system, and a safeguard system, where the partial nitrification reactor includes a water inlet pipe, a water distributor, a partial nitrification filler, and a triangular weir; the operation control system includes an on-line ammonia nitrogen monitoring probe, an on-line dissolved oxygen monitoring probe, an operation control center, a variable-frequency micro-nano aerator, a circulating water tank, a circulating pump, and an external circulating pipeline; and the safeguard system includes the on-line ammonia nitrogen monitoring probe, an on-line effluent nitrate nitrogen monitoring probe, a safeguard control center, a dosing peristaltic pump, and a safeguard chemical.