Method for preparing melamine

A high-voltage method of the method for preparing urea melamine, wherein the method for conveying the melamine to the container made of the solid melamine, melamine and container introduced by ammonia, and cooling. Adding excessive ammonia gas as to the melamine for preparing the mass ratio at least 0.01 and gas/liquid thereof. Then the spraying device for atomization mixture to the container, wherein the vessel generation ammonia gas in the ammonia reduced pressure. The melamine and a expansion and amount of the ammonia for introducing cooling and coagulation, wherein the melamine powder. The melamine melt directly to the melamine powder polymerized of the; and a cooling the melamine powder and novel the ammonia pressure.