High Tower compound fertilizer is one of the new technology of compound fertilizer production in China. It is a kind of urea and potassium fertilizer melt granulation method, the ammonium phosphate is heated by metering, urine and potassium slurry, and then sprayed into the tower by the nozzle to produce compound fertilizer particles. Both the appearance and the internal quality and the increase in crop yield, are far better than the ordinary compound fertilizer sold on the market.