The invention belongs to the technical field of agricultural machinery and relates to a self-propelled multifunctional fertilizer distributor. The self-propelled multifunctional fertilizer distributor comprises a fertilizer tank, a fertilizer spreader and a speed regulation motor, and the fertilizer tank, the fertilizer spreader and the speed regulation motor are mounted on a tractor. The bottom of the fertilizer tank is provided with a discharging port, and a fertilizer discharging grooved pulley driven by the speed regulation motor is arranged at the discharging port. The fertilizer spreader is a screw fertilizer spreader driven by a power takeoff on a gearbox of the tractor, and the center of the screw fertilizer spreader is below the fertilizer discharging grooved pulley. The screw fertilizer spreader comprises a rotating shaft and two groups of screw blades fixed to the rotating shaft, the two groups of blades are in central symmetry relative to the middle of the rotating shaft, and outer diameters of the blades are gradually increased from the middle of the rotating shaft tow two ends. Screw pitches of the blades are in two types and axially distributed at intervals along the rotating shaft. The self-propelled multifunctional fertilizer distributor has the advantage that fertilizer distribution amount can be regulated timely according to agricultural requirements to realize precise fertilization.