The invention discloses a power supply device for an electric safety acquisition module. The power supply device comprises a three-phase rectifying energy taking module and a power supply mode adjusting module. The three-phase rectifying energy taking module comprises an iron core, an energy taking coil, a compensation coil, an EMI (Electromagnetic Interference) filter, an overvoltage protection circuit, a rectifier-filter circuit and a control module. The power supply adjusting control module is matched with a lithium battery through a super-capacitor, and is adjusted by a control circuit to obtain three power supply modes for supplying power to a load. By adopting the wound iron core, air gaps are prevented from being formed in the iron core, and then vibration noise is prevented; under the action of the control circuit, the energy taking coil is matched with the compensation coil, meanwhile, a PWM (Pulse Width Modulation) alternating-current chopper circuit is added to the compensation coil loop, and counter magnetic flux is adjusted by adjusting the magnitude of the rear-end voltage, so that deep saturation of the energy taking magnetic core in high current is avoided, and energy is taken within a large current range in a distribution cabinet with complex environment. The super-capacitor is matched with the rechargeable battery, so that the power supply reliability, stability and continuity of the energy taking device are improved.