The present invention relates to a water culture apparatus and a water culture system using the same. The water culture apparatus includes a post, an installation frame, cultivation trays, a main supply pipe, a main supply line, an inflow branched pipe, an inflow line, a connection line, a discharge line, and a discharge pipe. Particularly, the cultivation trays are mounted at intervals on the installation frame in the lengthwise direction of the installation frame, and are arranged on multiple levels to correspond to the installation frame in the vertical direction of a post. The levels of the cultivation trays are installed to be inclined at a certain angle so that adjacent levels are alternately arranged from the top level to the bottom level. Therefore, the cultivation trays are alternately arranged on the multiple levels in the vertical direction to be inclined at a certain angle. A culture solution is supplied from the main supply pipe through the inflow branched pipe by the inflow line to the cultivation tray on the top level, and then the culture solution is sequentially supplied to the cultivation trays arranged on the multiple levels below. Accordingly, the culture solution is easily supplied to the insides of the multiple trays; a large number of plants can be cultivated and easily managed. Moreover, unlike the prior water culture apparatus, loss of the culture solution can be minimized as the culture solution can be efficiently absorbed into the plants.
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