The invention discloses a tank cover motor pull rod guiding ring, comprising an outer ring, an inner ring and screen spring plates; wherein the screen spring plates are arranged at the periphery of the inner ring near the outer ring and are arranged symmetrically; a limiting hole and a guiding hole are arranged in the guiding ring; the diameter of the limiting hole is more than that of the guidinghole, thus limiting the head part of the motor pull rod in the limiting hole. The limiting hole is arranged in the inner ring; the guiding hole is arranged in part of the inner ring connected with the outer ring and the outer ring. A groove is arranged between two screen spring plates. The invention also discloses a tank cap opening guiding system provided with the guiding ring, comprising a motor pull rod; wherein, the head part of the motor pull rod is arranged in the limiting hole of the guiding ring. The tank cap opening guiding system ensures that the motion direction of the pull rod ofthe tank cover opener is vertical to the pull rod base through the fixation and limit of the guiding ring, evenly stressing the pull rod. The system can greatly improve the reliability of electricallyopening the tank cap.