The invention discloses a preparation process for a stainless steel wire. The process comprises the following steps that firstly, an online coating drying device is used for coating a wire rod with a coating agent and drying the coating agent; secondly, the wire rod is guided into a thick straight wire-drawing machine to be continuously drawn 3-5 times; thirdly, surface heat treatment is carried out, the drawn wire rod is guided into a heat treatment furnace to be subjected to surface brightening treatment, and after heat treatment is completed, water cooling, water washing and drying are carried out; fourthly, the online coating drying device is used for coating the wire rod with the coating and drying the coating agent; fifthly, the wire is guided into a thin straight wire-drawing machine to be continuously drawn 3-5 times; sixthly, surface heat treatment is carried out, the drawn wire rod is guided into the heat treatment furnace to be subjected to surface brightening treatment, and after heat treatment is carried out, water cooling, water washing and drying are carried out; seventhly, the online coating drying device is used for coating the wire rod with the coating agent and drying the coating agent; eighthly, the wire rod is guided into a straight wire-drawing machine to be continuously drawn 12-13 times; and ninthly, wire taking is carried out. According to the preparation process for the stainless steel wire, the floor space of a production line is small, the quality of produced products is high, and the wire taking efficiency is high.