The improved terminal block structure comprises a body, a lower terminal base, an upper terminal base, and an elastic component. The lower terminal base is vertically configured in an opening slot of the body, and the lower terminal base comprises a stopper; the upper terminal base vertically slides in the opening slot and vertically slides with respect to the lower terminal base, the orientation of a screw component of the upper terminal base corresponds to a tapped hole of the lower terminal base, and the upper terminal base comprises an another stopper and the orientation of which corresponds to the stopper; and the elastic component is vertically configured in the opening slot and pushing against the body and the upper terminal base from between, and provides an elastic prestress for the upper terminal base to vertically slide with respect to the lower terminal base.