Abstract: Traditional mechanical code discriminator has complex structure,many moveable parts,larger volume and difficult to be fabricated and assembled.Presented a new type design idea named QQ mechanical code discriminator,including micro mechanical maze,piezoelectric driver,stepper position detection,energy isolator.Integrated mechanical code discrimination,stepping driving,stepper angle detection and energy physical isolation in a compacted structure,driving inside and decoding outside,maximum volume utilization and minimum load torque need,easy to be MEMS fabricated and less parts number,easy to realize flat package,it can be widely applied in various energy physical isolation for high-class safety fields.Operation principle and design analysis were detailed introduced.