Abstract: Provided are a laser cutting device and a laser cutting method. The laser cutting device comprises a beam expanding element provided with a plurality of lens sets, wherein optical axes of the plurality of lens sets are located in the same line and each lens set comprises at least one lens; the beam expanding element is configured to convert an incident beam into a first beam; and a spectroscopic element arranged on a light path of an emitted light of the beam expanding element, and wherein the spectroscopic element is configured to convert the first beam into multiple second beams that are annular and spaced apart from each other.

Abstract: Provided are a laser cutting device and a laser cutting method. The laser cutting device comprises a beam expanding element provided with a plurality of lens wherein optical axes of the plurality of lens sets are located in the same line and each lens set comprises at least one lens; the beam expanding element converts an incident beam into a first beam; and a laser splitting element and the first beam are arranged in an emitting optical path of the beam expanding element, and the laser splitting element converts the first beam into a plurality of second beams spaced from one another. In the laser cutting device, by means of providing the laser splitting element, the first beam is converted into the plurality of second beams, so as to obtain the effect of beam adjustment.