Wood product cutting device and cutting method

The wood product cutting device comprises a discharging box body, a plurality of guiding assemblies which are arranged at equal intervals are arranged at the upper end of the discharging box body, and a cutting mechanism which is fixed to the upper end face of the discharging box body through bolts and used for cutting wood products is arranged on one side of each guiding assembly. A fixing mechanism is arranged on the side, away from the guide assembly, of the cutting mechanism, a protective box is arranged at the position, close to the rear end, of the outer surface of the fixing mechanism, and a first circle cutting mechanism penetrating into the discharging box and a second circle cutting mechanism penetrating into the protective box are arranged in the fixing mechanism. A mounting box body is arranged at the rear end of the protective box body; when the device is used, richness and selectivity are higher, annular and arc-shaped grooves with different depths can be formed in different positions of the out