Three-dimensional ratchet trigger structure with non-return function has a housing, and a clamping block disposed in the housing. A central shaft is disposed on the clamping block, and a top block having a climbing surface is formed on a annular surface of the clamping block. A pivot part of a trigger is pivotally mounted on the housing. The pivot part protrudes toward the clamping block by a circular arc-shaped main ratchet strip. The central shaft is repositionably sleeved with a main ratchet block, and the main ratchet block is provided with bottom blocks matching each of the top blocks. When the trigger is pressed and rotated in the forward direction, the main ratchet block unidirectionally locks the main ratchet strip. When the main ratchet strip is disengaged from the main ratchet block, the main ratchet strips reverse the main ratchet block with its bottom edge, and the main ratchet block traverses along the climbing surface with its bottom block to flip off the plane of the main ratchet strip. The present invention can reduce the amplitude of the idle stroke of the main ratchet block when the trigger is released, so that the structure of the non-return effect is more compact.一種扳機三維棘齒逆止構造，是在外殼內設有一卡塊座，在該卡塊座穿設一中軸，並在該卡塊座圓環形的端面形成具有爬升面的頂塊，在該外殼樞接一扳機的樞接部，由該樞接部朝該卡塊座凸伸一圓弧形的主棘齒條，在該中軸可復位地套設一主卡齒塊，在該主卡齒塊設有配合各頂塊的底塊；當扳機受壓而順向轉動時，該主卡齒塊單向地卡制該主棘齒條，當該主棘齒條脫離該主卡齒塊而以其底緣反向撥動該主卡齒塊時，該主卡齒塊以其底塊沿著爬升面橫移跳脫該主棘齒條所在的平面，能減少放開扳機時反向撥動該主卡齒塊的空行程幅度，使逆止的構造更為緊湊。
