Full-automatic variable-pitch slitting cutter mechanism and full-automatic variable-pitch method

The invention discloses a full-automatic variable-pitch slitting cutter mechanism and a full-automatic variable-pitch method. The full-automatic variable-pitch slitting cutter mechanism comprises a mechanism bottom plate, a variable-pitch screw, a variable-pitch driving motor and a variable-pitch guiding device, and the variable-pitch screw, the variable-pitch driving motor and the variable-pitch guiding device are installed on the mechanism bottom plate. The variable-pitch screw is provided withmultiple guide spiral grooves; the screw pitches of the multiple guide spiral grooves are sequentially changed in an equal difference mode, cutter assemblies are arranged on the variable-pitch guide device and comprise cutters and guide driving rods, and the guide driving rods of the cutter assemblies are inserted into the multiple guide spiral grooves in a one-to-one correspondence mode. The output end of the variable-pitch driving motor is connected to one end of the variable-pitch screw and can drive the variable-p