The invention discloses a palm plant leaf type wind turbine blade and a manufacturing method thereof. The palm plant leaf type wind turbine blade comprises a shell; a main reinforcing rib is arranged in the shell and is located at the thickest part of the shell; side reinforcing ribs are fixed between the main reinforcing rib and two sides of the shell respectively; paving layers are arranged at the upper part and the lower part of the main reinforcing rib and the side reinforcing ribs respectively; and the side reinforcing ribs are located between the main reinforcing rib and the paving layers and are arranged at intervals. Results show that the wind turbine blade designed by adopting palm plant leaf vein imitating structure can adapt to a limit load range from 0.5m/s to 30m/s which is wider, the windward angle can be automatically changed according to the structural rigidity of the wind turbine blade, and therefore the working state can be changed, and the fatigue life can be greatly prolonged.