Potassium fulvic acid dissolving device as well as dissolving method and application thereof

The invention belongs to a potassium fulvic acid dissolving device as well as a dissolving method and application thereof. The potassium fulvic acid dissolving device comprises a potassium fulvic acid material storing tank, a urea evaporation system and a urea evaporation and granulation system, wherein a waste liquid desorption outlet of the urea evaporation system is connected with a liquid inlet of a solid-liquid ejector through a stirring tank and a first centrifugal pump; a solid inlet of the solid-liquid ejector is connected with the potassium fulvic acid material storing tank through a star-shaped valve; an outlet of the solid-liquid ejector is connected with a circulating liquid inlet of the stirring tank through a pipeline mixer; a potassium fulvic acid solution outlet is formed in the lower part of the stirring tank, and is connected with the material storing tank through a first filter and a second centrifugal pump; and the material storing tank is connected with the urea evaporation and granulatio