A power-assisted folding knife, comprising: a blade holder comprising a first portion and a second portion; a blade arranged in the blade holder; a handle rotatably connected to the blade holder; a locking mechanism for locking the blade holder in an unfolded position and/or a folded position; wherein the power-assisted folding knife further comprises: an assisting mechanism connected to the blade holder and the handle, for providing assisting power when unfolding the power-assisted folding knife; characterized in that the assisting mechanism comprises a steel wire, an arc-shaped slot being arranged in the first portion of the blade holder and a slot being arranged in one side of the second portion of the blade holder which faces toward the blade; wherein the steel wire being arranged between the first portion and the second portion; the axis of the arc-shaped slot coinciding with a first rotation axis, the first rotation axis referring to a rotation axis of the blade holder and the handle, a first end of the steel wire being provided with a first curved part passing through the arc-shaped slot and embedded in an aperture of the handle; wherein a second end of the steel wire being provided with a second curved part embedded in the slot; wherein during the folding process of the power-assisted folding knife, a torque produced by the elastic force of the steel wire enables the blade holder and the handle to rotate in a direction of folding after the second end of the steel wire passes over the extension line of the connection line of the first end and the first rotation axis, so as to realize the self-lock of the power-assisted folding knife. a blade holder comprising a first portion and a second portion; a blade arranged in the blade holder; a handle rotatably connected to the blade holder; a locking mechanism for locking the blade holder in an unfolded position and/or a folded position; wherein the power-assisted folding knife further comprises: an assisting mechanism connected to the blade holder and the handle, for providing assisting power when unfolding the power-assisted folding knife; characterized in that the assisting mechanism comprises a steel wire, an arc-shaped slot being arranged in the first portion of the blade holder and a slot being arranged in one side of the second portion of the blade holder which faces toward the blade; wherein the steel wire being arranged between the first portion and the second portion; the axis of the arc-shaped slot coinciding with a first rotation axis, the first rotation axis referring to a rotation axis of the blade holder and the handle, a first end of the steel wire being provided with a first curved part passing through the arc-shaped slot and embedded in an aperture of the handle; wherein a second end of the steel wire being provided with a second curved part embedded in the slot; wherein during the folding process of the power-assisted folding knife, a torque produced by the elastic force of the steel wire enables the blade holder and the handle to rotate in a direction of folding after the second end of the steel wire passes over the extension line of the connection line of the first end and the first rotation axis, so as to realize the self-lock of the power-assisted folding knife. an assisting mechanism connected to the blade holder and the handle, for providing assisting power when unfolding the power-assisted folding knife; characterized in that the assisting mechanism comprises a steel wire, an arc-shaped slot being arranged in the first portion of the blade holder and a slot being arranged in one side of the second portion of the blade holder which faces toward the blade; wherein the steel wire being arranged between the first portion and the second portion; the axis of the arc-shaped slot coinciding with a first rotation axis, the first rotation axis referring to a rotation axis of the blade holder and the handle, a first end of the steel wire being provided with a first curved part passing through the arc-shaped slot and embedded in an aperture of the handle; wherein a second end of the steel wire being provided with a second curved part embedded in the slot; wherein during the folding process of the power-assisted folding knife, a torque produced by the elastic force of the steel wire enables the blade holder and the handle to rotate in a direction of folding after the second end of the steel wire passes over the extension line of the connection line of the first end and the first rotation axis, so as to realize the self-lock of the power-assisted folding knife.