According to the characteristics of waste PCB（ Printed Circuit Board）,an energy-efficient disassembly device was designed in this paper. PCB was heated by high temperature and high speed gas. And then the THD（ Through Hole Device）and SMD（ Surface Mount Devices） on PCB were removed by spiral hob. The cutter parameters were optimized for the optimization goal the minimum damage of THD. The research results showed that: When the diameter of the knife roller is 30 mm,the helix angle is 26°,the blade pressure angle of 0°,spiral line number is 4,the dismantling effect of THD is the best.New methods and technologies are provided for the efficient,green waste PCB recycling processing.