A submersible pump capable of providing low voltage power supply comprises a pump body and a filter cover connected to the pump body; a stator containing cavity and a rotor containing cavity is provided in the pump body; the outside of the rotor containing cavity is provided with an impeller room, and the upside of the impeller room is provided with a water outlet; a silicon steel sheet group of a stator and a stator coil are encapsulated in the stator containing cavity in the pump body; a permanent magnet rotor is fixed in the rotor containing cavity in the pump body via a rotor shaft; an impeller at one end of the permanent magnet rotor is located in the impeller room; it also comprises an internal transformer; the internal transformer is provided with a low voltage coil, and the stator coil acting as a high voltage coil, and the two coils are located at the silicon steel sheet group of the stator; the low voltage coil provides AC low voltage power supply to the outside. An internal transformer is constitute by the original silicon steel sheet group of the stator, the original stator coil, and an appended low voltage coil; this design occupies small room, and can provide AC or DC low voltage power supply to the outside as the submersible pump is working, so it is safe to use, and works reliably.