The present invention relates to a power-assisted artificial limb structure, which comprises a support member, a paw component, and a linear driving device. The support member is fixed to a human body. The paw component is pivoted to the support member. The linear driving device is pivoted at the rear end of the paw component and is connected to the support member. The linear driving device drives the paw component to rotate in order to simulate the angle variation of ankle joint of the healthy leg of the human boy. As such, the present invention may achieve the symmetry of ankle joint angles for the sick leg and the healthy leg while the human body is walking and may reduce the consumption of physical power.
