A waste water settling pond of a beneficiation system comprises a first water pond, a second water pond, a third water pond and a fourth water pond, which form a square frame; a maintenance well is arranged at the center of the square frame formed by the first, second, third and fourth water ponds; a draining pipe I is arranged on the first water pond; a draining pipe II is arranged on the second water pond; a third draining pipe III is arranged on the third water pond. The waste water settling pond has the beneficial effects that the structure is reasonable, the waste water discharged from the beneficiation system is fully settled to be clean by a four-settling mode, harmful substances in the waste water are fully eliminated, environment is prevented from being polluted by the waste water, the environment-friendly effect is good, body health of people can be ensured, work staff are prevented from accidentally falling into the waste settling pond by rails, personal safety of the work staff is ensured, the use effect is good and the waste water settling pond is beneficial for promotion.