Large plate flash automatic cutting device and cutting method

The invention provides a large plate flash automatic cutting device which comprises a chassis wheel assembly, a first gantry assembly, a second gantry assembly, a scanning positioning assembly and a cutting assembly. The first gantry assembly and the second gantry assembly are both fixedly connected to a first platform of the chassis wheel assembly; the scanning positioning assembly is slidably connected with the first gantry assembly through a telescopic rod, and the cutting assembly is fixedly connected to the second gantry assembly. The bottom of the first gantry support is fixedly connected with the first platform, the bottom of the second gantry support is connected with the second guide rod through a sliding pair, and the second guide rod is fixedly connected with the first platform through a second base. According to the automatic cutting device, the position of a flash can be accurately determined through structured light, the position of the flash is marked through the laser transmitter, cutting is a