The utility model discloses a bus-stacked current transformer, which comprises a bus-stacked current transformer body, a secondary terminal and an erection joint plate, wherein the secondary terminal and the erection joint plate are disposed on the bus-stacked current transformer body which comprises more than three current transformers and the more than three current transformers are connected in serious mutually. In order to satisfy requirements for energy measurement and line protection better, in the bus-stacked current transformer in the utility model, the more than three transformers are stacked and assembled into a big-load current transformer which is accurate in measurement, convenient in installation and reliable in operation.