The present invention relates a LED bulb structure, including: a base, a screw connector which is integrated with the end of the base, and a LED driver; a lamp body is mounted on the base, the top portion of lamp body is a platform on which an PCB substrate is arranged, LED lights are located on the PCB substrate, a lampshade which is engaged with a ring-shape groove of the platform. A reflector assembly includes a reflecting cover support which is inserted in the ring-shape groove located at the edge of the platform, and a reflecting cover which is loaded from the bottom of the reflecting cover support. The reflector assembly further can include a horn-shape reflector which is located above the LED lights inside the lampshade, and has a big small shape with two openings shaped by mean of complete revolving a parabola.