The invention relates to a control power input isolation circuit for an electric automobile. The circuit includes an anti-reverse connection circuit; the input end of the anti-reverse connection circuit is connected to a control power VCC, the output end is connected to the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected to the input end of a capacitance-resistance absorbing circuit, the output end of the capacitance-resistance absorbing circuit is connected to the input end of a common mode current filter circuit, the output end of the common mode current filter circuit is connected to the input end of a Y-type capacitor isolation and filter circuit, and the Y-type capacitor isolation and filter circuit adopts Y-type capacitors CY1 and CY2 and is connected to an automotive housing through the capacitors CY1 and CY2. According to the control power input isolation circuit, a rectifier diode D1 is arranged for reverse connection prevention, a voltage stabilization diode Z1 is arranged for voltage stabilization, the capacitance-resistance absorbing circuit is arranged for voltage filter, a common mode inductor L is arranged for current filter, the Y-type capacitors CY1 and CY2 are arranged for raising the potential, the power is isolated from the automotive housing, the insulation of the control power with the automotive housing is improved, the immunity of the control power is improved effectively, and the stability of system operation is guaranteed.