The invention discloses a folding handle device. The folding handle device comprises a grip provided with an assembling section and a holding section which are connected, and a containing groove concavely formed in the assembling section, an operation handle is assembled inside the containing groove, a limiting set penetrates through and is pivoted to the grip and the operation handle, the limiting set limits the operation handle, the grip is fixed to the T-shaped state forming an included angle with the grip, the grip can be firmly supported so as to bear large torsion generated by two-hand operation so that deflection cannot be caused, and therefore a driving head combined with the operation handle can effectively perform large-torsion tightening and loosening operation on a screw piece;the limiting set can release the operation handle and is pivotally swung inside the containing groove in the grip to be folded into the coaxial using state, the occupied space can be decreased, and the device is convenient to store, carry and use and has the good using progressiveness.