Abstract: A fabrication method for a steel thin-walled tailor-welded part and a hot-stamped part prepared by using the tailored welded part, the method comprising: using steel plates (10, 10, 20) to be welded which have an aluminum or aluminum alloy coating (12, 12?, 22, 22?) is used; by means of adjusting the composition of a shielding gas (50) and the composition of a welding wire (30) during a welding process, in combination with the control of the welding speed and wire-feeding speed, controlling the content of free aluminum in a weld seam to be 0.1 to 4.0 wt. %, which prevents the production of iron-aluminum intermetallic compounds in the weld seam during a tailor welding process while ensuring that an appropriate amount of ferrite which is distributed in a dispersed manner is produced in the weld seam. The weld seam structure of the obtained tailor-welded part is +1 to 15 vol. % martensite, +0 to 5 vol. % ferrite which is distributed in a dispersed manner, and the remainder is austenite.