The invention discloses a strain field real-time reconstruction method based on an electrical logging technology in the technical field of large-scale structure electrical logging. The method comprises the following steps: firstly, carrying out numerical analysis on a test piece in advance to obtain a relationship between a test point position and a corresponding strain value and scatter data, andconstructing a low-fidelity agent model based on a large amount of finite element numerical scatter data; secondly, starting a formal test, pre-recording actual strain measuring point distribution information, extracting measuring point test data information of corresponding positions in the test process in real time, constructing a high-fidelity agent model based on a small amount of measuring point test data information, and describing accurate values of certain positions on a test piece in the actual test; and finally, based on the low-fidelity agent model and the high-fidelity agent model, constructing a variable-fidelity agent model, and reconstructing the strain field data at the non-test measuring point to realize the reconstruction of the strain field. The calculation efficiency can be improved on the premise of ensuring the precision, real-time reconstruction in the test process is realized, and process monitoring and risk control are provided for the test.