A tunnel lining formwork device in which an insert for inserting a precast concrete bracket for supporting a wind strength slab according to an embodiment of the present invention is embedded includes a mold having an insert insertion hole into which an insert is inserted, and the insert insertion hole with respect to the mold The insert insert reinforcement hole is reinforced to be welded and reinforces the thickness of the insert insertion hole, and the reinforcing material is formed with a first connection pin through hole penetrating in the direction perpendicular to the thickness direction, and the reinforcing material and connection pin A second connecting pin through hole that is locked by a cylindrical body portion formed in a direction perpendicular to the direction of the insert insertion and reinforcing hole, a bolt portion extending from one end of the cylindrical body portion, and disposed on the top of the cylindrical body portion When dismantling, a cylindrical bolt having a head portion used for a handle, a bracket fixture which is screwed with the bolt portion of the cylindrical bolt and is disposed on the mold back side and is coupled with a bracket for supporting a wind-level slab and a reinforcing reinforcement portion extending from the bracket fixture It characterized in that it comprises a formed insert.
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