The utility model discloses a leaf spring is towards snap, cope match -plate pattern and lower bolster including the relative up -down setting, the bottom surface both sides of cope match -plate pattern have set firmly the uide bushing, the top surface both sides of lower bolster have set firmly the guiding axle, the direction ways is established on the guiding axle, and have and follow guiding axle reciprocating motion's the degree of freedom from top to bottom, the middle part top of cope match -plate pattern is equipped with the die shank, the middle part bottom is equipped with the connecting block, the bottom connection of connecting block is equipped with the terrace die, be equipped with the die holder on the lower bolster, the top of die holder is inlayed and is equipped with the die block relative with last terrace die, the top face that connects at the pressure spring who lies in the die holder is touched to the die block below, central locating pin is worn to be equipped with in the die block middle part, top salient in the die block top surface of center locating pin. The utility model discloses simple structure, it is convenient to make, has improved the production efficiency in the strong nest hole of flat spring to can effectively ensure flat spring's litter hole qualification rate of dashing, have stable performance, convenient operation, advantage that the batch processing ability is good.