Machining die and method for aerosol can

The invention discloses a machining die and method for an aerosol can. The machining die for the aerosol can comprises a reducing female die, a reducing edge pressing die and a reducing male die; the reducing male die comprises a boss and a straight wall; the arc of the boss tangent to the straight wall is a canned arc; the reducing male die specifically comprises a first male die, a second male die and a third male die; the canned arcs of the first male die, the second male die and the third male die are the same in radius and sequentially increased in length; the outer diameter of the reducing edge pressing die is the same as the inner diameter of a circular blank can; and the reducing female die and the reducing edge pressing die have the same inner diameter. According to the die, the three reducing male dies with the same canned arc radius and sequentially increased length are adopted, and the canned part of the can body is gradually stretched into the can shape of a finished can while the can body is sub