Abstract: The current leakage protection models for building electrical construction are mostly target based protection treatments, which have low efficiency and lead to an increase in abnormal misidentification rate. Therefore, research on leakage protection technology for building electrical construction based on current sensors is proposed. Based on the current demand for leakage protection, real-time leakage monitoring nodes and leakage protection mechanism settings are first deployed, combined with current sensors to enhance overall efficiency and construct a leakage protection model for building electrical construction using current sensors. Using symmetrical protection assistance to achieve processing. The test results show that compared with PVZVR booster leakage protection technology and the implementation method of additional DC selective low-voltage leakage protection, the current sensor building electrical construction leakage protection technology designed in this study has a relatively low rate of abnormal misidentification and is generally controllable. Moreover, in different background environments, the implementation effect of the leakage protection device is better.