The invention relates to an optical index testing system for an automatic insertion type shunt, and aims to solve the technical problem of waste of time and labor force during current manual testing of the optical index of the insertion type shunt. The optical index testing system comprises an insertion return loss tester provided with a common end connecting plug for being connected with the insertion type shunt and an insertion end connecting plug, and a support plate, wherein a first cylinder is arranged on the support plate; the common end connecting plug is arranged on the end part of a telescopic shaft of the first cylinder; two spaced bearings are arranged on a support rod; a screw rod capable of rotating circumferentially is arranged in the two bearings; one end of the screw rod is connected with a servo motor; a screw rod casing which is matched with the screw rod is further arranged on the screw rod in the two bearings; a mounting plate is further arranged on the screw rod casing; a second cylinder is further arranged on the mounting plate; the insertion end connecting plug is arranged on the end part of a telescopic shaft of the second cylinder.