Abstract: An expert navigation device based on actual welding data of an embodiment includes: a welding variable acquisition unit that acquires welding variable data of an expert through a bigdata platform; a welding line extraction unit that analyzes a base material, which is a welding target, through a camera mounted on a welding helmet to acquire the welding line in the base material; a synchronization unit that generates a trigger, which serves as a reference point, for matching the welding variable data acquired through the welding variable acquisition unit to the welding line acquired through the welding line extraction unit; and a navigation output unit that displays information of the welding variable data to a user when a welding location reaches a trigger point while welding is performed based on the trigger point generated by the synchronization unit.