The present invention relates to the field of smart pumps, and particularly to a power supply for a smart pump controller, comprising a mains input device, a bridge rectifier circuit and a step-down circuit. The mains input device is electrically connected with one end thereof to the mains supply, and electrically connected with the other end thereof through the bridge rectifier circuit sequentially to an input end of the step-down circuit, and the output end of the step-down circuit is electrically connected to the smart pump controller. The power supply for a smart pump controller provided in the present invention can be implemented, in terms of hardware, by just one integrated circuit, three capacitors, four diodes and one inductor with no need for peripheral components and parts such as a transformer, an optocoupler and a reference source, allowing a great reduction in costs of the power supply for a smart pump controller. Moreover, the power supply for a smart pump controller in the present invention may
