A neutralization processing system for an ammonia-containing waste fluid, which neutralizes the ammonia-containing waste fluid containing ammonia, the neutralization processing system includes: one or more neutralization sludge tanks; a sludge discharge line configured to supply the ammonia-containing waste fluid to the neutralization sludge tank; a neutralizer supply line configured to supply a neutralizer to the neutralization sludge tank; a sludge circulation line configured to discharge the ammonia-containing waste fluid stored in the neutralization sludge tank from the neutralization sludge tank and return the ammonia-containing waste fluid to the neutralization sludge tank; and a sludge transfer pump provided in the sludge circulation line and configured to move the ammonia-containing waste fluid.