In view of the shortcomings of difficult upgrading and maintaining of the traditional photovoltaic-energy storage combined power device,studys the multifunctional photovoltaic-energy storage combined power device based on modular design concept,describes the basic principle and operation mode;analyzes the current situation of technical specifications and standards;basing on three level DC/DC and DC/AC standard power module,uses the overvoltage suppression and ultra high-speed control technology to make the equipment access to network safely and efficiently;finally, the test is carried out based on photovoltaic-energy storage combined power generation test system.