The invention discloses a pre-twisted spacer, belongs to the technical field of spacing devices of overhead conductors of electric transmission lines, and in particular relates to the pre-twisted spacer. The invention provides the pre-twisted spacer which can improve stress performance between the spacer and the conductor and is convenient to install. The pre-twisted spacer provided by the invention comprises a support rod, and has a structural feature that cable clamps are arranged at two ends of the support rod, the outer ends of the cable clamps are arc-shaped clamping slots, the cable clamps are provided with arc-shaped through holes arranged along the outlines of the clamping slots, and a pre-twisted strip is penetrated into each arc-shaped through hole; the inner ends of the cable clamps are connection clamping plates, connection holes are correspondingly formed in the end parts of the connection clamping plates and the support rod, the end parts of the support rod are placed into the connection clamping plates, a hinge pin passes through each connection hole, a transverse positioning hole is arranged on the front end rod of each hinge pin, and a positioning bolt is penetrated into the positioning hole; the middle part of each support rod is connected with one end of an arc-shaped revolving arm via the corresponding hinge pin, the other end of the arc-shaped revolving armis fixed with a connection plate at the end part of a core rod, umbrella skirt sets are arranged on two sides of the core rod, and equalizing rings are arranged on the core rod where the umbrella skirts are close to the end parts of the core rod.