The present invention relates to a trunk lid torsion bar tension adjusting device for a vehicle, which comprises a torsion bar (20) fixed to a trunk lid hinge (30) of a vehicle and capable of maintaining the open state of the trunk lid A bracket 10 for fixing one end of the torsion bar 20 to the vehicle body; A moving shaft 15 fixed to the upper surface of the bracket 10 to move the bracket 10 up and down; And a control lever 16 which is integrally formed on the upper end of the moving shaft 15 so as to be moved up and down by rotating the moving lever 15. When the trunk lid is sagged due to the deterioration of the elasticity of the torsion bar due to long-Since the torsion bar is provided with a torsional tension by the simple operation of the lever, it is possible to maintain a good open state of the trunk lid.
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