The utility model relates to an arm saw electric control system is taken to liquid electricity, including remote control operation system, wireless receipts / send out system, remote control / local transition system, PLC control center, hydraulic power system, take arm mode switch device, swing arm traveling system, hydraulic pressure annular band saw drive arrangement, the remote control operation system pass through RS 485 PORT COMs and wireless receipts / send out the headtotail, after remote control / local operating system carries out the switch processing through RS 485 communication ports be connected with PLC control center, realize program control to hydraulic power system, band saw mode switch device, swing arm traveling system, hydraulic pressure band saw drive arrangement behind the PLC control center analysis processes. The utility model discloses have that the remote control local controls that the mode is optional, liquid - electricity combination drive, have concurrently the band saw perpendicular / the level mode of saw cutting is optional, multiple functional, flexible operation, smooth and easy, simple and convenient.