Automatic feeding apparatus

The invention discloses an automatic feeding device which comprises a container and two or more chemical feeding containers installed above the container. The feeding ends of the chemical feeding containers extend into the container, the side wall of the container is provided with a water inlet, a siphon liquid discharging device for discharging liquid in the container out of the container is installed at the bottom of the container, the container is provided with a mixer enabling the container to be divided into an upper-layer liquid mixing area and a lower-layer liquid mixing area, the upper-layer liquid mixing area is directly or indirectly communicated with the lower-layer liquid mixing area, and the feeding ends of the two chemical feeding containers extend into the mixer. By means of installation of the mixer which enables the container to be divided into the upper-layer liquid mixing area and the lower-layer liquid mixing area, liquid and/or powder in the chemical feeding containers flows into the mixer to be mixed under the action of gravity of the liquid and/or powder and then flows into the lower-layer liquid mixing area, water flows in from the water inlet to dilute mixed liquid, and when the water level of the lower-layer liquid mixing area exceeds the siphon water level of the siphon liquid discharging device, the mixed liquid in the lower-layer liquid mixing area is discharged out of the container through siphon action.