The invention provides an adjustable rolling tube type fertilizer applicator, which relates to the technical field of agricultural production and comprises a push-pull rod and a rolling tube, wherein one end of the push-pull rod is connected with the rolling tube through a rolling frame, a main body of the rolling tube consists of a cylindrical tube body and rolling wheels arranged at both ends of the tube body, a rolling shaft is arranged inside the tube body, and material feeding holes are arranged on the rolling wheel arranged at one end. The adjustable rolling tube type fertilizer applicator has the advantages that the structure is simple, the use is convenient, the rolling tube type design is adopted, the push-pull operation can be freely realized, the efficiency is high, the labor is saved, the corrosion injury on both hands caused by contact of both hands with fertilizers is avoided, grown young crops can not be damaged in the fertilization application process, the fertilizing holes arranged on the rolling tube can be freely opened or closed, the size of the fertilizing holes can be regulated according to the size of fertilizer particles, further, the fertilization application quantity is regulated, the fertilization application is uniform, and the fertilizers are not wasted.