The utility model discloses an automatic fertilization control system with adjustable fertilizer blockage sensitivity. The fertilizing device comprises a fertilizing controller, a fertilizing enablingswitch which is arranged on a fertilizing machine operating table and is connected with the fertilizing controller, a driving fan which is positioned on the rear side of a driving platform, and a fertilizing opening which is positioned on the rear side of the fertilizing machine, a sensor is arranged on the inner side of the fertilization opening, the sensor is used for detecting the blockage state of the fertilizer opening in real time and sending state information to a fertilization controller, and the fertilization controller adjusts power of a fertilization driving fan according to a preset blockage sensitivity threshold value so as to control the fertilizer amount. According to the automatic fertilization control system with the adjustable fertilizer blockage sensitivity, refined automatic fertilization control can be achieved, fertilizer blockage can be effectively avoided, the fertilization operation uniformity and the fertilizer utilization rate can be improved through the technology, and the operation cost is reduced.