Vertical necking machine for copper exhaust pipe fitting

The utility model relates to a vertical necking machine for a copper exhaust pipe fitting, which comprises a base, a pipe body fixing structure arranged at the upper part of the base, a drilling and shrinking unit structure arranged at the upper part of the base, and a bottom penetrating lining structure arranged at the lower part of the base and vertical to the drilling and shrinking unit structure, the pipe body fixing structure comprises a side end locking air cylinder arranged on the machine base, an actuating side pressing die structure arranged at the output end of the side end locking air cylinder, a fixed leaning pressing die structure arranged on a horizontal machine base of the actuating side pressing die structure, and a bottom through hole formed in the machine base between the actuating side pressing die structure and the fixed leaning pressing die structure. The penetrating structure of the bottom penetrating lining structure penetrates through the bottom through hole and is perpendicular to the