The invention discloses a punch capable of accurately positioning and quickly feeding for punching a thin-wall metal tube. The punch comprises a rack main body, a pushing device, a blanking passage, a punch, a console and a feeding mechanism, wherein the punch is arranged on the left side of the rack main body and is used for clamping and positioning the thin-wall metal tube and automatically sending the thin-wall metal tube to the feeding mechanism in the punch so as to be fixed to the rack main body, the pushing device and the blanking passage are respectively fixed to the rack main body on both sides of the feeding mechanism, and the console is fixed to the rack main body and is used for controlling the pushing device and the feeding mechanism to move. The punch has the advantages of simple and compact structure, low production cost, high degree of automation and no need of manpower, the automatic loading, clamping, positioning, feeding, processing and discharging of the thin-wall metal tube can be completed, and the processing efficiency is greatly improved.