The invention relates to the technical field of 
hay mower blade 
machining, and discloses a 
machining method of a high-strength handheld 
hay mower blade. The 
machining method comprises the following steps: S1, cutter forming is carried out, 
molten steel in a 
molten state is injected into a mold, and cooling is carried out after the blade is formed; S2, 
cutting edge 
punching is carried out, and the 
cutting edge position is continuously punched multiple times; S3, thermal forming and heat treatment are carried out, specifically, a cutter is put into a 
heating furnace at the temperature of 1000 DEG C to be subjected to thermal 
forging forming, isothermal 
quenching is carried out for 10 minutes, and the 
hardness of the quenched blade is 40-45 HRC; S4, 
tempering is conducted, the temperature in the 
heating furnace is reduced to 500 DEG C at the speed of reducing 100 DEG C per minute, and 
tempering is conducted for 30 minutes at the temperature of 500 DEG C; S5, shot blasting is conducted, the cutter is put into a shot 
blasting machine to be subjected to surface 
polishing for 2 minutes; and S6, surface treatment is conducted, and the cutter is put into an 
electrophoresis device to be subjected to black 
electrophoresis. The problem of 
cutting edge breakage can be solved, the cutting 
edge strength is high, the process steps are shortened, the machining efficiency is improved, and the manufacturing cost is low.