The invention discloses a garden fertilizing device. The garden fertilizing device comprises a machine shell, an elastic device is arranged in the machine shell and penetrates through the side wall ofthe lower end of the machine shell, a drill bit is fixedly connected to one end of the elastic device located on the outer side of the machine shell, a fertilizer box is fixedly connected to the sidewall of one side of the machine shell, the side wall of the upper end of the fertilizer box communicates with a feeding port, an inner shell is fixedly connected to the inner wall of the side, closeto the machine shell, of the fertilizer box, an open hole is formed in the side wall of the side, close to the fertilizer box, of the machine shell, the machine shell communicates with the inner shellthrough the open hole, a transmission device is arranged in the inner shell, the end, close to the open hole, of the transmission device penetrates through the open hole and extends into the machineshell, and the end, away from the inner shell, of the transmission device is fixedly connected with the elastic device. According to the garden fertilizing device, fertilizers can be thrown beside a drilled hole through the elastic device and the transmission device, the fertilizers do not need to be thrown by bending down manually, and the working intensity of workers is reduced.