Abstract: The present invention relates to a plug-in bulb coupling structure, comprising a lamp cap provided on a bulb and a plug-in lamp holder provided on a power line, wherein a plug-in end of the plug-in lamp holder is provided with plug-in holes and raised barbs, and conductive tubes connected to a lead are provided in the plug-in holes; the plug-in end of the plug-in lamp cap is provided with conductive bars and barb holes, and the conductive bars are connected to a drive circuit board in the plug-in lamp cap. With the coupling structure of the present invention, the drive circuit board and the SR of the power line can be assembled and connected to each other quickly. The operation is easy, convenient and quick and does not require any tools.