The invention discloses a mobile flash welding method for 136RE+SS heat treatment steel rails, and particularly relates to a mobile flash welding method for 136RE+SS heat treatment steel rails in the technical field of steel rail welding. The mobile flash welding method for 136RE+SS heat treatment steel rails comprises the flash and smoothing stage, the pulsation stage, the acceleration melting stage, the upsetting stage and the pressure maintaining stage. The total heat input of welding in the welding process is 7.1 MJ to10.0 MJ. The total duration of welding is 110 seconds to 135 seconds. The upsetting amount of welding is 12.8 millimeters to 16.7 millimeters. With the mobile flash welding method for 136RE+SS heat treatment steel rails, mobile flash welding can be successfully carried out on 136RE+SS heat treatment steel rails, the number of internal effects of steel rail joints is small, the welding quality of steel rail joints is stable, and the steel rail joints can pass the fatigue test, the tensile test and the static bending test and meet the requirements; and the steel rail joints can pass the drop hammer test carried out with fifteen flash welding joints, and are good in stability.