The invention discloses a crankshaft structure of a V-shaped six-cylinder engine. Two ends of the crankshaft are a free end and a power output end, projection is carried out along a direction from the free end to the power output end, a first toggle, a second toggle and a third toggle are sequentially arranged along the clockwise direction, an included angle between the first toggle and the second toggle is 120DEG, an included angle between the second toggle and the third toggle is 120DEG, and the firing order of the crankshaft is 1-2-3. The firing order is in favor of reducing the torsional vibration amplitude of a crankshaft system and improving the strength, the torsional oscillation and the strength of the crankshaft.