Provided is an energy reset monitoring circuit of a battery managing system. The circuit comprises a charge pump charging circuit, an overvoltage protection circuit, an RC discharging circuit, a clamping circuit, a transformer T and a metal-oxide semiconductor field effect transistor (MOSFET) tube Q. The charge pump charging circuit is composed of a resistor R1, a resistor R2 and a capacitor C1. The overvoltage protection circuit is composed of a voltage-regulator diode D1. The RC discharging circuit is composed of a voltage-regulator diode D2, a capacitor C2 and a resistor R3. The clamping circuit is composed of a voltage-regulator diode D3. A primary dotted terminal of the transformer T is connected with power positive voltage V+, and a primary non-dotted terminal of the transformer T is connected with a drain D of the MOSFET tube Q. A source S of the MOSFET tube Q is grounded. The energy reset monitoring circuit has the advantage that the charge pump and the RC circuit are used for achieving the functions of transformer energy zero returning monitoring of a battery managing system and balancing component magnetic saturation prevention, and transformer magnetic biasing and component damage caused by large primary winding current are effectively avoided. The circuit is simple in structure, low in cost and suitable for transformer high-frequency situations.