Drawing die with built-in locking mechanism

The utility model discloses a drawing die with a built-in locking mechanism. The drawing die comprises a male die and a female die positioned above the male die, the male die is slidably sleeved witha blank holder, the bottom of the blank holder is connected with a left elastic return rod and a right elastic return rod, and the other ends of the left elastic return rod and the right elastic return rod penetrate through the male die to be connected with the machine tool body located below the male die; the top of the blank holder located on the left side of the male die is in threaded connection with a horizontally-arranged air cylinder, and a locking propeller is fixedly connected to a piston rod of the air cylinder; the bottom of the female die located above the male die is connected with a floating female die, and the floating female die is elastically connected with the female die through a nitrogen spring. When the stamping die is used for stamping a prefabricated part, the prefabricated part is subjected