The present invention provides an LED bulb and a lamp head structure hereof. The lamp head structure includes an insulating seat, a first conducting plate, a second conducting plate and a conducting piece. The insulating seat has a first accommodating space and a second accommodating space separately arranged and an opening slot communicating with the second accommodating space. The first conducting plate is accommodated in the first accommodating space. One end of the conducting piece inserted in the first conducting plate is electrically conducted with each other, and the other end is protruded out of the insulating seat. The insulating seats could be provided for different types of LED bulb. Thus the development time will be shortened, and the production cost will be reduced.