Provided is a lead wire supporting frame especially for a power transmission cable tower lightning arrester test. The lead wire supporting frame is characterized by comprising a clamp, a main supporting rod, and a pawl-shaped supporting mechanism. The clamp is connected with the top of the main supporting rod through a cross bar. The pawl-shaped supporting mechanism comprises a sliding sleeve, multiple branch pawls, and inclined supports for supporting the branch pawls. The sliding sleeve sleeves the main supporting rod in a sliding manner. The top of each branch pawl is hinged to the sliding sleeve. The multiple branch pawls are uniformly arranged around the axis of the main supporting rod. The top of each inclined support is hinged to the middle of the corresponding branch pawl. The bottom of each inclined support is hinged to the bottom of the main supporting rod. By means of the lead wire supporting frame, it is prevented in a test that a lead wire, because of overweight, drags the leading-out plug and the conductor plug of a copper net shielding layer so as to enable a junction to be unreliable or even damaged.