The present invention discloses a preparation method for a Kelaonie nitrogen-deficiency plant nutrient solution, wherein premixed ingredients of the Kelaonie nitrogen-deficiency plant nutrient solution is used for preparing the Kelaonie nitrogen-deficiency plant nutrient solution. As nutrients in the premixed ingredients are prepared in a content ratio in the nutrient solution, premixed ingredients need to be weighed once during preparation to directly enter into a dissolving procedure, complex procedures including repeated weighing, mother solution preparation, storage, separation and the like in conventional nutrient solution preparation are eliminated; under a condition that the original effect is ensured, the labor is reduced, the work efficiency is greatly improved, and the promotional prospect is wide.