The present invention relates to an automatic water supply apparatus, which comprises a water container having a water supply tube supplying water from outside, a container support connected to the water container through a connection tube, and a container holding planted plants, mounted on the top of the container support, and having a water inlet on the bottom thereof so that water is flowed in and supplies water to the container through the water inlet by controlling water flowed in through the connection tube. The automatic water supply apparatus comprises a water inlet pipe having a water entrance pipe having a &prime?&prime shape so that an opening/closing means opening/closing the inside while guiding the water entered from the connection tube to the inside of the container through the water inlet is installed, and connected to the connection tube so that water is flowed in in the horizontal direction of one side, a discharge pipe vertically inserted into the water inlet to supply water to the inside the container, and a control pipe installed to have the opening/closing means, which opens/closes the discharge pipe, inserted into in the horizontal direction of the other side and a control means including a first elastic unit having an arch shape, in which one end is fixed to the bottom of the container support, and the other end slides in the horizontal direction to be able to move, and a pressurizing unit installed on the other end of the first elastic unit pressurizing the opening/closing means. When the container is mounted on the top of the first elastic unit, and presses the first elastic unit by the own weight, the pressurizing unit pressurizes the opening/closing means to block the water inlet, which enables the non-powered automatic water supply apparatus corresponding to changes in the soil moisture content to block water supplied to the container corresponding to the weight of the soil contained in the container.COPYRIGHT KIPO 2014본 발명은 외부로부터 물이 공급
