The invention relates to the field of compound fertilizer production, and discloses a production technology of a slurry type compound fertilizer. In the preparation process, an anti-blocking agent in added to effectively solve the crystallization and hardening problems of the slurry type compound fertilizer; the preparation of the compound fertilizer is not limited by the types of the nitrogen fertilizers, but can be precisely matched according to the plant nutritional requirement; the prepared slurry type compound fertilizer can be preserved for at least four months above at normal temperature, is not required to be stirred regularly, and further cannot generate the crystallization or hardening phenomenon; when being applied as a leaf fertilizer, the anti-blocking agent can be dissolved in water, so that the slurry type compound fertilizer cannot block a sprayer; after application of the fertilizer, the anti-blocking agent can be quickly decomposed, so as not to generate environment pollution; in the slurry grinding process, the ingredients are simply added, so that the production technology is simple, convenient and feasible in processing process, capable of saving labor and effort, and low in cost.