2. Compared with the prior art, in the patented technology of the utility model, a plurality of blades are nested together, which not only saves space and blade materials, but also occupies a small volume and is convenient to carry and store. Moreover, each blade can be taken out quickly and independently, and the access efficiency is high. Moreover, a larger magnetic handle is adopted, which is convenient to hold, improves the comfort of the cutter, and is safe, reliable and stable to use.