The invention discloses a pneumatic deep digging fertilizer distributor and belongs to the technical field of garden machines. The pneumatic deep digging fertilizer distributor comprises a fertilization mechanism, the fertilization mechanism comprises a first linear driver, an air pick and a supporting seat, the bottom of a first telescopic rod of the first linear driver is connected with the upper side of the supporting seat, the air pick is detachably connected with a shock excitation rod, and a shock excitation rod section on the lower side of the air pick is provided with an air inlet and liquid inlet block integrally connected with the shock excitation rod. The shock excitation rod section below the air pick is hollow, the air inlet and liquid inlet block is communicated with the hollow shock excitation rod, the upper portion of the shock excitation rod is connected to the supporting seat, the shock excitation rod is parallel to the first telescopic rod, the bottom side of the shock excitation rod is connected with a scarifier with the conical lowermost portion, a liquid applying cavity is formed in the scarifier, and an exhaust and liquid drainage hole is formed in the position, corresponding to the liquid applying cavity, of the scarifier. An air inlet and a liquid inlet are formed in the air inlet and liquid inlet block. Compressed air is introduced into the air inlet, and liquid fertilizer is introduced into the liquid inlet. The gas permeability of soil is improved, liquid pesticide is evenly applied into the plant root system easily, and plant growth is promoted.