The disclosure provides a lawn mower. The lawn mower includes a cutter assembly, a housing, and a power assembly supplying power for the cutter assembly. The cutter assembly includes a first/second blade. The first blade and the second blade are staggered and arranged back and forth. The housing includes a mowing space. The mowing space includes a first/second mowing cavity communicating with each other and respectively housing the first/second blade. A width of the mowing space is greater than a width of the first/second mowing cavity, and is smaller than a sum of the widths of the first mowing cavity and the second mowing cavity. An overlapping part is provided by overlapping of cutting areas of the first and second blades. A ratio of a width of the overlapping part to the width of the mowing space is from 0.01 to 0.09.