Integrated automatic dissolving tank for soluble fertilizer

The integrated automatic dissolving tank comprises a plurality of dissolving tanks connected in parallel and a controller, a heating device, an upper-layer screen and a lower-layer bearing net are arranged in each dissolving tank, a feeding hole and a water inlet hole are formed in the top of each dissolving tank, a water outlet is formed in the lower portion of each dissolving tank, and a water outlet is formed in the lower portion of each dissolving tank. The water outlet is formed in the lower part of the lower-layer bearing net and the upper part of the fertilizer liquid collecting area. When water flow passes through fertilizer particles and is partially dissolved, due to the fact that the particle size of the fertilizer particles is reduced and smaller than that of a lower-layer load-bearing screen, all the fertilizer particles sink to the lower portion of a dissolving tank through the lower-layer load-bearing screen and continue to be dissolved along with flowing of the water flow, and a water outlet i