The invention discloses a polyaluminum chloride copper coagulating device. The polyaluminum chloride copper coagulating device comprises a coagulating chamber, wherein the coagulating chamber is of aconical barrel-shaped structure; a second bracket is mounted at the bottom inside the coagulating chamber; a hollow barrel is mounted on the second bracket; groups of spirally arranged flow-guiding sheets are fixed to the inner wall of the barrel; the flow-guiding sheets are fan-shaped; two groups of symmetrically arranged first brackets are mounted on the inner wall of a side edge of the coagulating chamber; steel tubes are mounted on the two groups of first brackets; spray guns are mounted at ends of the steel tubes; the spray guns on the two groups of steel tubes are in opposite directions;an air pump is mounted at the bottom of the side edge of the coagulating chamber; an air outlet of the air pump is connected with a first air pipe; an adjusting valve is mounted on the pipe section of the first air pipe; two second air pipes are communicated with one end, away from the air pump, of the first air pipe. The polyaluminum chloride copper coagulating device can drive a fluid to flow rapidly through a high-pressure air flow and can generate a vortex through flowing of the fluid so as to jointly achieve rapid dissolution of polyaluminum chloride copper and generate an extremely goodflocculating effect.