The utility model discloses a defoaming buffering box for floating selection. The defoaming buffering box comprises a box body, a feeding pipe, a discharging pipe and high pressure water pipes, wherein the feeding pipe is communicated with the upper part of one sidewall of the box body; the discharging pipe is communicated with the lower part of the other sidewall of the box body; a plurality of high pressure water pipes are uniformly distributed in the box body; spraying heads are connected to the lower ends of the high pressure water pipes; a plurality of pores are uniformly distributed at the lower middle parts of the high pressure water pipes and the bottom parts of the spraying heads. According to the defoaming buffering box, the floating selection foam products are fed into the box body, foam is broken under the impact effect of the spraying water, so that a pump is avoided cavitation during later transportation, and the service life of the pump can be prolonged; the spraying heads are used for spraying water to the bottom part of the box body, so that solid materials can be prevented from depositing at the bottom of the box, and ore pulp can be transported conveniently.