The invention discloses a cable pulley head provided with double supporting plates. The cable pulley head comprises two supporting plates, a bracket connected with the two supporting plates, a pair of side plates fixed on the bracket, a pair of conical rollers mounted on the pair of side plates, two support frames fixed on one side of one side plate and the opposite side of the other side plate and a pair of lateral guide wheels arranged on each support frame, wherein the axis of each lateral guide wheel is perpendicular to the axis of the corresponding conical roller; an end extending plate is arranged on the bracket, and a connecting hole is formed in the end extending plate; buffering and aligning mechanisms connected with one pair of lateral guide wheels are arranged on the support frames; a locking mechanism is arranged in the connecting hole. The cable pulley head is simple in structure, convenient to manufacture and low in cost, can be used for cleaning of a matched guide rail and doesn't easily get stuck.