Variable rate fertilization device for cotton planting

The invention relates to the technical field of agricultural machinery, in particular to a variable-rate fertilizing device for cotton planting, and provides the following scheme aiming at the problem that a fertilizing device for cotton planting in the prior art cannot conveniently and timely crush a fertilizer and cannot sufficiently convey the fertilizer to the roots of cotton: the variable-rate fertilizing device comprises a vehicle body, the trolley comprises a base and a push rod fixed to the top of the base, and four wheels are installed at the bottom of the base; the material mixing mechanism comprises a material mixing hopper mounted at the top of the base and a stirring assembly mounted on the material mixing hopper, and a first material conveying pipe is mounted at the bottom of the material mixing hopper; and the material grinding mechanism comprises a material guide pipe fixed to the bottom of the first material conveying pipe, a material conveying auger rotationally connected into the material g