The invention provides an electromagnetic type undervoltage release which comprises an EMC circuit, a full-wave rectifying circuit, a power circuit, a comparison circuit, a trough circuit, a driving circuit, a switching circuit and an electromagnet, wherein the EMC circuit is used for restraining interference signals in a double-direction mode, and the interference signals are from a power grid and are generated by an interior circuit. The positive output end of the full-wave rectifying circuit is connected with the power circuit, the comparison circuit, the trough circuit and the electromagnet, the output end of the power circuit is connected with the comparison circuit, the trough circuit and the driving circuit, and the output end of the comparison circuit is connected into the trough circuit. The output end of the trough circuit is connected with the driving circuit, the output end of the driving circuit is connected with the switching circuit, and the output end of the switching circuit is connected with the electromagnet. The electromagnetic type undervoltage release is safe and reliable in control circuit, simple in structure and easy to achieve, the calorific value of a coil of the electromagnet is small, a power wave chopping device is small in wave chopping voltage, the generated electromagnetic interference is small, and the working efficiency is high.