Building insulation layer fastening device and fastening method thereof

The invention relates to a building insulation layer fastening device which comprises an insulation layer fixation special nail shooter and an insulation layer fastener and provides a fastening methodusing the insulation layer fixation special nail shooter and the insulation layer fastener. The fastening method comprises the steps: firing nail-shooting pills by the special nail shooter to generate energy and transferring the energy to a second piston rod of the special nail shooter; then, punching shooting nails arranged in a fastening rod of an insulation layer fastener into a building external wall basal body by the second piston rod so as to realize the fastening operation of an insulation layer; and taking out the second piston rod from the fastening rod after punching and sticking cement mortar to the exterior of the insulation layer fastener to fully separate the insulation layer fastener from the insulation layer so as to finish the whole fastening operation. The invention hassmart conception, simple design, convenient operation and good fastening effect and is mainly used for the fastening operation of building insulation layers.