The invention discloses an automatic 
assembly machine for nesting a screw lamp holder on a lamp body. The automatic 
assembly machine mainly comprises a rack, pneumatic receiving claws, a nesting base, a positioning base, a needle 
pipe, pneumatic screw holding claws, pneumatic 
electric wire holding claws and a controller. When the automatic 
assembly machine works, the pneumatic receiving claws close, the screw lamp holder is put on the upper surfaces of the pneumatic receiving claws, and then the positioning base moves downwards so as to position the screw lamp holder; afterwards, the pneumatic screw holding claws tightly hold the screw lamp holder, then the pneumatic receiving claws open, and the pneumatic 
electric wire holding claws tightly hold electric wires extending out from the lamp body so as to position the electric wires; afterwards, the needle 
pipe moves downwards to pass through a through hole of the head of the screw lamp holder and continuously moves downwards till the electric wires are inserted into the interior of the needle 
pipe, the electric wires are positioned by the needle pipe at the moment, then the pneumatic 
electric wire holding claws open, the whole nesting base moves downwards, and finally the whole screw lamp holder is nested on the lamp body. The automatic 
assembly machine has the beneficial effects that the electric wires can accurately pass through the screw lamp holder in the process of nesting the screw lamp holder on the lamp body, and the 
automation of screw lamp holder installation is realized.