An embodiment of the present invention provides a current acquisition device. The current acquisition device comprises a current transformer and a current acquisition circuit, wherein the current transformer comprises an iron core, and a secondary winding is wound on the iron core; The output terminal of the secondary winding is connected with the current acquisition circuit, and the rated load ofthe secondary winding is 1 to 2 times of the total sampling load of the current acquisition circuit. The total sampling load of the current acquisition circuit includes the sampling load of the current acquisition circuit and the connection impedance between the output of the secondary winding and the current acquisition circuit. The technical schemescheme of the invention can improve the accuracy of the current measurement by the current transformer and the ratio of the saturated current to the rated current of the current transformer, thereby simultaneously realizing the measurement and protection functions of the current transformer.