The invention discloses a small electrochemical luminescence immunoassay analyzer which comprises a machine frame with a platform at the bottom. The platform is provided with a special reagent unit, a sample bin unit, an incubation unit and a general reagent unit. An upper platform is arranged above the rear portion of the machine frame and provided with a mechanical arm unit. The mechanical arm unit comprises a first mechanical arm provided with a sampling needle and a second mechanical arm provided with a rear processing needle. The machine frame is further provided with a measurement and analysis unit, a liquid path unit, a displayer unit and a board card control unit, wherein the measurement and analysis unit is used for measuring and analyzing an incubated reaction sample, the liquid path unit is used for controlling the sample, the reagent and the waste liquid flow direction, the displayer unit is used for human-computer interaction, and the board card control unit is used for carrying out circuit control over the units. The small electrochemical luminescence immunoassay analyzer has the advantages that the structure is compact, the occupied area is small, the reagent can be preserved for a long time, the whole incubation process and measurement and analysis process are high in automation degree, human assistance is not needed, manual errors are reduced, the measurement precision is excellent, measurement is easy and convenient, and working efficiency is greatly improved.