A labor-saving trigger driving structure has a housing and a handle being mounted on the housing. An opening is formed on a front side of the handle, and a trigger is pivotally connected with the housing through the opening. A driving device is disposed on a top of the trigger, and a curved abutting surface is formed on a front side of the driving device. A track is formed in the housing extending in a straight line, and a driving holder is slidably disposed on the track. A driving surface is disposed on the driving holder, and a driving surface is slidably connected with the curved abutting surface. When activating the trigger, an angle between the track, the curved abutting surface and the driving surface is less 20 degrees (equal to plus or minus 10 degrees). Therefore, when the trigger is pressed and rotated, a force applied to the trigger can be concentrated to drive the drive holder forward for achieving a labor-saving drive effect.一種扳機省力傳動構造，是在外殼設有一握柄，在該握柄頂側的前面形成一開口，在該開口穿設一樞接在該外殼內的扳機，在該扳機的頂部設有一驅動件，在該驅動件的前側形成一曲面的頂靠面，在該外殼內形成一沿前、後方向直線延伸的軌道，在該軌道滑動設有一驅動座，配合該頂靠面在該驅動座設有一驅動面，該驅動面是曲面且與該頂靠面滑動地接觸，在該扳機樞轉的過程中，該頂靠面與該驅動面接觸點的法線方向與該軌道延伸方向的夾角保持在小於正負10度角；因此，當扳機受壓而順向轉動時，使用者對扳機的施力能集中用於驅動該驅動座前進，達到省力的傳動效果。
