In order to solve the defects in the prior art that existing electronic mutual inductors are complex in structure and the signals of the existing electronic mutual inductors are easily interfered, the utility model provides a current sampling and protecting circuit for electronic current transformers, which comprises a low-power coil, a shielding twisted pair and a primary collector. The low-power coil and the primary collector are connected together through the shielding twisted pair. The primary collector internally comprises a digital-to-analog conversion circuit, a current transformer, a sampling resistor, a filter resistor and a filter capacitor. The current transformer T2 is used for linearly isolating and transforming a received secondary small current. Meanwhile, the secondary small current is converted into a voltage signal by the sampling resistor. After that, the voltage signal is subjected to the anti-aliasing and filtering treatment by means of a filter composed of the filter capacitor and the filter resistor. According to the technical scheme of the utility model, by means of the current sampling and protecting circuit, no integrating circuit is in need, so that the circuit is simple in structure. Meanwhile, by means of the current transformer, the signal isolation and insulation reinforcement effect is realized. Therefore, the test accuracy and the test reliability are ensured.