The utility model relates to the technical field of agricultural m achinery, especially, relate to an agricultural fertilizer injection unit, including the bottom plate, the below of bottom plate is equipped with drive arrangement, four corners of bottom plate are equipped with the bracing piece, the top of bracing piece is connected with the roof, be equipped with the storage vat on the roof, the top of storage vat is equipped with the pan feeding mouth, comprising a base plate, the discharge gate is located the below of roof, be equipped with the baffle between bottom plate and the roof. The utility model provides an agricultural fertilizer injection unit has set up the slide that can rotate, under the effect of centrifugal force, and interior even the spilling to the field of fertilizer of slide to the angle of slide can be adjusted, thereby the end that fertilizer was shed to the slide highly changes, and the area that fertilizies so also changes, fertilization that this device can be even, and the fertilization area is adjustable, and convenient to use.