Provided are a manufacturing method for a USB interface metal casing and a manufacturing apparatus therefor, wherein the manufacturing method for a USB interface metal casing comprises the steps of: loading a flat-shaped pipe blank to a lower die (S100); clamping a first upper die and the lower die, and performing pipe-expansion forming to the bottom of the pipe blank (S110); clamping a second upper die and the lower die, and performing necking chamfer to the top opening of the pipe blank (S120); and clamping a third upper die and the lower die, and correcting the pipe blank to obtain a final finished product of a USB interface metal casing (S130). In the manufacturing method for a USB interface metal casing provided in the present invention, three clamping processes are used to enable a USB interface metal casing to perform clamping respectively with three upper dies on one lower die station so as to complete processes of pipe expansion, necking chamfer and shaping, so that the USB data line interface metal casing which meets the dimension requirement can be achieved once, the technology is simple, the material at a fillet of the USB interface metal casing has uniform shrinkage, and the dimensional accuracy of the finished product is stable.