The invention discloses an optimized low-voltage current transformer assembly line detection method. According to the method, a preventive test of a low-voltage current transformer and an error test of the low-voltage current transformer are simultaneously performed through two stations; transformers to be detected in the two stations are both arranged on the same transformer test center-penetrating current rod; in an open-circuit test at the preventive test station, a transformer set to be detected is divided into a first set of transformers and a second set of transformers, the open-circuit test is performed on the first set of transformers and the second set of transformers synchronously, and the transformers to be detected in each set are in series connection one by one for asynchronous tests; the test of one set of the transformers to be detected at the error test station and the test at the preventive test station are performed synchronously. According to the method, the preventive test cycle of the transformers is changed to about 6.5 minutes from 13 minutes, the error test cycle of the transformers is still about the original 8 minutes, through grouping and station separation, the test cycle of the transformers is shortened to about 8 minutes from original 21 minutes, and the detection efficiency is improved by about 60%.