The utility model discloses an internal frame of a connector. The internal frame comprises a pedestal and a top cover cooperative with each other, wherein the pedestal is provided with installation grooves of installation terminals in triangle arrangement, and the installation grooves are separated by separator plates, of which the front-section end faces are planar, and the rear-section end face is provided with insertion bars. Slots are arranged in the inner surfaces of the side plate bodies on the two sides of the pedestal. The top cover comprises a positioning plate and a cover plate having a hollow trapezoid structure, the two border bodies of the cover plate cooperate with the slots, and an opened groove is arranged in the center. Clamping slots matching with the insertion bars are arranged in the two side surfaces in the groove. The positioning plate is on the bottom of the cover plate, and cooperates with the bottom of the pedestal. The internal frame employs an integral structure, effectively protects the riveted joint of a conductive terminal and a conductor, and realizes automatic assembly. Three conductive terminals can be pressed at one time, lowers cost and improves production efficiency.