The present invention is a housing; An input terminal portion for power supply formed on one side of the housing and protruding from the plug pin; An output terminal for power supply formed on the other side of the housing and having a pin insertion hole into which a plug pin of an air conditioner is inserted; The circuit board includes a circuit board mounted inside the housing, wherein the circuit board is a short-circuit connection part short-circuited to start power supply from the input terminal part to the inside when an overflow occurs due to a failure of the drainage pump, and an input terminal part through a short circuit of the short-circuit connection And a relay unit that cuts off the supply of power to the output terminal unit by the current applied from the circuit board, and ends of the first and second conductors connected to the input terminal unit for power supply are electrically connected to the circuit board, and the ends of the second conductors are electrically connected to the power supply unit. Ends of the third and fourth conductors connected to the output terminal are electrically connected, and the short-circuit connection includes a line insertion hole into which ends of a pair of control lines are inserted to cut off the power supplied to the air conditioner from the drain pump. It provides a safety shut-off device for power supply of an air conditioner with a detachable outlet connected to the drain pump, characterized in that.
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