Punching die capable of realizing self-lubrication

The utility model discloses a punching die capable of realizing self-lubrication, which comprises a punching die body and an external automatic oil feeder, and the punching die body comprises an upperdie holder, a lower die holder, a cutter, a punch, a material returning plate and a lower die block; a plurality of cutter body oil inlet channels, a cutter body main oil channel and a cutter body branch oil channel are formed in a cutter body of the cutter, a plurality of oil storage grooves are formed in the inner side face, forming the peripheral face of the cutting hole, of the cutter, a plurality of oil outlet holes are formed in the back face of each oil storage groove, each oil outlet hole is communicated with one cutter body branch oil channel, and the cutter body branch oil channelsare communicated with the cutter body main oil channel. Wherein the cutter body main oil duct is communicated or fused with the cutter body oil inlet duct, the cutter body oil inlet duct is communicated with a cutter body oil