The present invention relates to a septic tank provided with check valves on the partitions formed inwardly, and a plurality of partitions are formed inwardly so that the partitions are buried in the ground so as to purify sewage sequentially. An inlet through which sewage flows into an upper side of each compartment is formed, and in a conventional septic tank in which a connection hole penetrating each compartment is formed in an upper portion of the compartment, a penetration through which connects the compartment to the middle of the compartment. A hole is formed, and a check valve for discharging water in accordance with the water pressure is provided in the inside thereof.If the partition wall is damaged during installation, the problem of having to recover and repair the septic tank is solved. It will have the effect of minimizing.
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