The invention discloses a folded airfoil surface unfolding mechanism. The folded airfoil surface unfolding mechanism is characterized in that the mechanism is composed of a stepping motor (1), a fixing nut (2), a gasket (3), an unlocking claw (4) and airfoil surfaces (5), the unlocking claw (4) is fixedly connected with an output shaft of the stepping motor (1) through the fixing nut (2) and the gasket (3), and four clamping claws of the unlocking claw (4) are embedded into positioning grooves of the four airfoil surfaces (5). The unlocking claw (4) rotates under driving of the stepping motor(1), and the airfoil surfaces (5) are separated from limiting of the positioning grooves of the unlocking claw (4) and unfolded in place under the action of the airfoil surface unfolding force. According to the folded airfoil surface unfolding mechanism, the defects that an existing guided munition folded airfoil surface unfolding mechanism is large in size, high in mass, difficult to assemble andlow in unfolding consistency are overcome.