An assembly fixture is disclosed. The assembly fixture is utilized for assembling a back combined pogo pin which comprises a barrel, a pin head, an elastic element, and a rear stopper. Said assembly fixture comprises a retaining member and a pressing member. The retaining member has an accommodating hole disposed thereon for accommodating the pogo pin that is not assembled yet. The pressing member is mounted on an upper fixing plate and disposed opposite to the retaining member. The pogo pin is assembled all together when the pressing member pushes the unassembled pogo pin. The assembly fixture is simple and can assemble the back combined pogo pin steadily and quickly.