The invention discloses a pneumatic soil-loosening and fertilizer-applying apparatus and method and belongs to the technical field of garden machines. The pneumatic soil-loosening and fertilizer-applying apparatus comprises fertilizer applying mechanisms and a supporting mechanism, wherein each fertilizer applying mechanism has a linear driver and an air pick; the bottom of a telescopic rod of the linear driver is connected with the upper side of the supporting seat; the air pick is detachably connected with a shock excitation rod; the shock excitation rod section on the lower side of the air pick is provided with an air and liquid inlet block; the shock excitation rod section under the air pick is hollow; the air and liquid inlet block communicates with the hollow section of the shock excitation rod; the upper part of the shock excitation rod is connected to the supporting seat; the shock excitation rod is parallel to the telescopic rod; the bottom side of the shock excitation rod is connected with a soil loosening device; the lowest part of the soil loosening device is tapered; a liquid applying cavity is formed in the soil loosening device; the soil loosening device corresponding to the liquid applying cavity is provided with at least one exhausting and liquid applying hole; and the air and liquid inlet block is provided with an air inlet and a liquid inlet. The supporting mechanism comprises a rack. A supporting arm is fixedly connected to the rack; and each linear driver is fixedly connected to the supporting arm. Soil ventilating property can be improved; and medicine liquid can be evenly applied to plant roots, so plant growth can be facilitated.