The utility model provides a low pressure generating line type current transformer structure, includes the epoxy main part, the troidal core, and the coiling has secondary winding on the troidal core, and secondary winding's both ends are connected with secondary binding post, and the iron core is integrative with epoxy main part pouring for the secondary winding, and epoxy main part central authorities are the generating line through hole one time, and above-mentioned troidal core is oval ultracrystallite iron core, and the major axis of its troidal core lies in the horizontal direction, and the secondary winding winding is in the left and right sides of oval ultracrystallite iron core the utility model discloses technical scheme adopts oval ultracrystallite iron core structure, and secondary winding twines in the left and right sides of oval ultracrystallite iron core, and the magnetic line of force is more level and smooth, reduces the distortion, reduces the loss, improves the measuring accuracy of mutual-inductor greatly, has reduced the height of mutual-inductor, has higher popularization and use value