The invention relates to the technical field of water supply equipment, and, more specifically, relates to full-time variable frequency water supply equipment. The equipment comprises a DC/AC conversion circuit, and the DC/AC conversion circuit comprises an insulated gate bipolar transistor, a capacitor, and a transformer. The DC/AC conversion circuit is in series connection with the capacitor. Avariable frequency power supply has the stable output power, cannot be affected by the fluctuation of the commercial power, can protect the circuit timely during an overloading or short-circuit fault,can protect the insulated gate bipolar transistor from being damaged, is stronger in anti-interference capability, prolongs the service life, and provides a perfect full-time frequency conversion function for the equipment.