The present invention relates to a toilet freeze prevention device, and more particularly, it is installed in the toilet overflow tube to supply water from the water tank to the overflow tube at a certain period when a water level difference occurs between the water tank and the overflow tube to freeze the toilet. It relates to a freeze protection device that can prevent The freeze protection device according to an embodiment of the present invention includes a siphon hose, a water level maintenance container installed at both ends of the siphon hose, and installed in the center of the siphon hose, and the fluid flowing from one end of the siphon hose to the other end by the siphon principle. It includes a flow rate control valve for controlling the flow, installed on the upper side of the siphon hose, and an air vent for discharging the air flowing into the siphon hose.
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