The invention discloses a buckle type current transformer. In the buckle type current transformer, an upper cover and a protection box are connected by a clamping element and fixed shafts, the clamping element is arranged on the upper cover, the fixed shafts are arranged on a transformer body, the clamping element is hinged with the upper cover, the clamping element can be buckled with the fixed shafts so that the clamping element and the fixed shafts are tightly connected and are easy to separate and combine, and a cable is convenient to assemble; the clamping element comprises a handle sheet and a buckle groove, the handle sheet and the buckle groove are integrally arranged, so that the integral clamping element is convenient to rotate; symmetric holes are formed in the middles of two cover sheets of the upper cover respectively, a fixed pin passes through the holes, springs are fixedly connected with the protection cover aside the two fixed shafts, fixed rings are arranged at the other ends of the springs, the springs at the two sides are arranged in a staggered way so that the fixed rings are arranged in a staggered way when in the same horizontal surface; and the upper cover covers the springs and partially covers the protection box, and the fixed pin passes through the hole in the cover sheet, sequentially passes through the fixed rings in the same horizontal line and then passes through the other hole in the cover sheet.