Coagulant for paint mist and application of coagulant

The invention discloses a coagulant for paint mist and application of the coagulant and belongs to the technical field of industrial paint-containing wastewater treatment. The coagulant for the paint mist comprises an agent A, an agent B and an agent C, wherein the agent A, the agent B and the agent C are used in cooperation, the agent A is a linear high-molecular polymer generated in the mode that melamine reacts with aldehydes, the agent B is an aqueous solution obtained in the mode that anionic polyacrylamide with the molecular weight of 8,000,000 to 10,000,000 is modified through composite sodium salt, the agent C is an aqueous solution of alkaline inorganic compounds, and the composite sodium salt is a mixture of sodium hydroxide, sodium sulfate and ammonium bicarbonate. According to the coagulant for the paint mist, paint-containing wastewater treatment efficiency reaches up to above 95%, about 1.5 yuan is cost for treating a ton of wastewater, 2-3 yuan is cost for treating a ton of wastewater through a coagulant for paint mist currently sold on the market, price is much reduced, and the price advantage is obvious.