The invention relates to an automatic calibrating system for a metering low-voltage current transformer. The automatic calibrating system for the metering low-voltage current transformer comprises a circulating box warehouse inlet-outlet connection, unstacking and stacking device (1), a material feeding and discharging module (2), a conveying line (3) and an appearance detection module (4), an insulation withstand voltage test module (5) and an error calibrating module (6), wherein the circulating box warehouse inlet-outlet connection, unstacking and stacking device (1) is arranged at one end of the conveying line (3), the material feeding and discharging module (2) is arranged between the circulating box warehouse inlet-outlet connection, unstacking and stacking device (1) and the conveying line (3), and fully automatic transformer verification devices (7), detection information electronic display boards (8) and system master controllers (9) are arranged at the two sides of the conveying line (3). Compared with the prior art, the automatic calibrating system for the metering low-voltage current transformer has the advantages of being compact in structure, high in automation degree, flexible, reliable and the like.