The utility model provides an isotope label synthesizer capable of synthesizing a plurality of radioactive tracers at the same time, which comprises nitrogen (1), a pipeline (2), a three-way valve (3), a raw material bottle (4), a reaction bottle A (5), a reaction bottle B (6) and a reaction bottle C (7). The isotope label synthesizer is characterized in that the nitrogen (1) is fed into the raw material bottle (4) through the pipeline (2). The raw material bottle (4) is connected with the three-way valve (3) through the pipeline (2). The three-way valve (3) is connected with the reaction bottle A (5), the reaction bottle B (6) and the reaction bottle C (7) through the pipeline (2). According to the technical scheme of the utility model, three radioactive tracers can be synthesized at the same time. Therefore, the isotope label synthesizer is time-saving, raw-material-saving and lower in cost.