Disclosed is a precipitation system for hydrometallurgical processing of laterite nickel ore, comprising a reaction tank, a feeding assembly, and a discharging assembly. Inside the reaction tank, there is a holding chamber; the feeding assembly comprises a first inlet pipe and a second inlet pipe; the discharging assembly comprises a material lifting pipe and a gas conduit, one end of the material lifting pipe is connected to the bottom of the holding chamber; the gas conduit extends into the material lifting pipe below the liquid level, and the connection between the gas conduit and the material lifting pipe is lower than the end of the material lifting pipe away from the holding chamber. By introducing gas into the material lifting pipe through the gas conduit, bubbles are entrained in the solid-liquid mixture within the material lifting pipe, the liquid level within the material lifting pipe rises, ultimately causing the solid-liquid mixture at the bottom of the holding chamber to be discharged through the material lifting pipe. This allows for the direct extraction of precipitates from the bottom of the holding chamber, extending the period between manual cleanings of the reaction tank.