The invention discloses a cone yarn packaging production line and a packaging technique thereof. The cone yarn packaging production line comprises an alignment device, a big end and small end detecting device, a turning device, a single-yarn cut-sealing machine, a single-yarn heat shrinkage machine, a lining device, a cut-sealing machine for a whole bag of cone yarns, and a heat shrinkage machine for the whole bag of cone yarns, wherein the alignment device, the big end and small end detecting device, the turning device, the single-yarn cut-sealing machine, the single-yarn heat shrinkage machine, the lining device, the cut-sealing machine for the whole bag of cone yarns, and the heat shrinkage machine for the whole bag of cone yarns are installed on a conveying device in sequence. According to the cone yarn packaging production line and the packaging technique thereof, cone yarns are adjusted to be in the vertical state through the alignment device; the big end and small end detecting device is used for detecting the positions of the big end and the small end of each cone yarn; the turning device is used for turning the cone yarns selectively; the single-yarn cut-sealing machine is used for packaging each single cone yarn through a damp-proof plastic film; the single-yarn heat shrinkage machine is used for making the plastic films tightly shrink onto the cone yarns; the lining device is used for lining the cone yarns according to a set number of lines and then packaging the whole bag of cone yarns through damp-proof plastic films. The heat shrinkage machine for the whole bag of cone yarns is used for making the plastic films firmly shrink onto the cone yarns, and then packaging of the whole bag of cone yarns is completed. The cone yarn packaging production line and the packaging technique thereof have the advantages that the automation degree is high, continuous volume production can be achieved, both manpower resources and material resources are saved, and the quality of the whole bag of packaged cone yarns is good.