The present invention relates to a device for preventing blow by gas of an intake manifold from being frozen, which prevents blow by gas discharged from a crankcase of an engine to flow into a PCV flow path of an intake manifold from being frozen, and comprises a thermal conductor provided to be in contact with a cylinder head and provided to be extended in the PCV flow path to transfer heat of the cylinder head to the PCV flow path. Therefore, heat is conducted from the cylinder head having a high temperature for a temperature of blow by gas to be increased, thereby preventing the blow by gas from being frozen in an intense cold environment.
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