The utility model discloses a fertilization device of a circle application type nest beating fertilizer applicator. The fertilization device comprises a fertilization barrel, a fertilization shell, a fertilization wheel, a main shaft, a chain wheel, a hopper, a spring, an adjusting sleeve, an adjusting nut, a fertilizer applicator stand and bearing seats, wherein two bearings are respectively arranged at the two ends of the main shaft and are respectively fixed in the bearing seats; the bearing seats are arranged on the fertilizer applicator stand; the chain wheel is fixed on the main shaft by a key; the fertilization wheel is fixed in the middle of the main shaft; a groove is formed in the fertilization wheel; the adjusting nut is screwed into the thread part on the main shaft; the spring is arranged in the fertilization wheel; the adjusting sleeve is arranged on the main shaft; one part of the adjusting sleeve is sheathed into the fertilization wheel; the spring is pressed by one end of the adjusting sleeve, and the other end of the adjusting sleeve is pressed by the adjusting nut; the fertilization shell is sheathed on the outer surface of the fertilization wheel; the upper part of the fertilization shell is provided with the hopper, and the lower part of the fertilization shell is provided with the fertilization barrel; the hopper is fixed on the fertilizer applicator stand by a steel plate. The fertilization device has the advantages that labor intensity and energy consumption are low, operation is simple, fertilizer is applied in a circular shape, and fertilizing amount control is accurate.