The invention relates to a measurement system for a secondary torsional force of a low-voltage current transformer. Work flow comprises the following steps: (1) transformer positioning that a detected transformer is in butt joint with detection equipment on a module mounting base; (2) parameter configuration that a touch screen tester of a digital dynamometer and a torque sensor are configured to measure a secondary terminal torsional force of the low-voltage current transformer in a high-precision manner and achieve a requirement of being compatible with dimensions of various variable ratios and various types of low-voltage current transformers; (3) parameter acquisition that the secondary terminal torsional force of the transformer is acquired through the torque sensor and is input to the digital display dynamometer; (4) data processing that high-speed processing is performed on the acquired parameter, a small change of a value is captured, and a data processing result is uploaded to a control system; and (5) completion of detection. The measurement system has the advantages of accurate positioning, the high automation degree and the high-speed processing capability; the measurement system reduces a movement error and the false detection rate, improves measurement precision and accuracy, and is convenient for repetitive operation; and the measurement system can capture the small change of the value and upload the data processing result to the control system.