The subject innovation is water tank (2), wherein the water tank (2) the aerobic tank 20 and the aerobic tank 20, which has a volume capable of sufficiently storing water to the incoming sewage to the sewage from an aerobic atmosphere to which sewage flows of configuring the anaerobic tank 50 having an anaerobic atmosphere to the bottom of the bottom surface, and the aerobic tank 20 is at a predetermined height on the first chasumak 52 and its upper portion for preventing the sewage from leaking to the bottom and the peripheral to the lower portion of the aggregate layer in which stack the gravel and sand 31, the aggregate layer 31, the plant 22, the plant 22 is the aggregate layer 31 is planted planted on top of the aggregate layer ( 31) to pass through and provides a movement path of the processed primary treated water and the aggregate layer (at least one or more of the horizontal vent pipe (26 buried in order to supply oxygen to 31) and the plant 22), said horizontal vent pipe ( 26) is provided connected to one side of the other side that is the opposite for the open to the atmosphere In order to move to the at least one or more vertical vent pipe (24), said horizontal vent pipe 26, the one set (50) anaerobic tea treatment intercepting into the installed connecting said horizontal vent pipe 26 in which air is introduced from the group composed of process water inlet pipe 32, and the anaerobic tank 50 to be treated that lead to 1 (50), an anaerobic tea to be treated that has passed through the treated water inlet pipe (32) of the aerobic tank 20 a second chasumak (52 '), the number of the primary treatment flows from the treated water discharge pipe 36 is provided so that the discharge pipe 36 and the number of processed first discharged from said treated water discharge pipe 36 to the bottom and around the leaking partition wall 54 for guiding the flow path, to a wastewater treatment device, characterized in that consisting of a discharge pipe (58) which moves along the partition wall (54) and processing the two discharging the tea to be treated to the outside. According to the present invention, does not require a device such as peompeo, agitators, blowers required in a typical sewage system, so no need for specialized operating personnel to manage the device machine using the power as well as take up less initial investment and maintenance costs Since the device has an effect that does not occur due to the disruption of sewage treatment failures.