Abstract: The present disclosure relates to a special lamp cap which includes a lamp holder, a lamp holder female plug, a lamp bulb male plug, a lamp bulb shell and a nut. The lamp holder female plug is fixedly connected with the lamp holder. The lamp bulb male plug is detachably and fixedly connected with the lamp holder female plug. One end of the lamp bulb male plug extends into the interior of the lamp holder female plug. The lamp bulb shell is internally provided with a luminous body. The lamp bulb shell is fixedly connected with the lamp bulb male plug. The nut is detachably and fixedly connected with the lamp holder female plug. The nut sleeves the outside of the lamp holder female plug.