Photovoltaic energy-storage storage battery charge/discharge system

An embodiment of the invention provides a photovoltaic energy-storage storage battery charge/discharge system. The system comprises a photovoltaic module, a Boost circuit, a Buck-Boost conversion circuit, a storage battery pack, a full-bridge inverter circuit and mains supply, wherein the photovoltaic module provides stable direct current bus through the Boost circuit; the storage battery pack is connected with the direct current bus through the Buck-Boost conversion circuit in a suspending manner to complete the charge/discharge control for the storage battery pack; and the mains supply and the load are connected with the direct current bus through the full-bridge inverter circuit in a suspending manner to complete the power supply control for the load. The photovoltaic energy-storage storage battery charge/discharge system can work under three working condition modes, including a photovoltaic power supply and storage battery charging operation, a photovoltaic power supply and storage battery charge/discharge output grid-connection operation with load, and a storage battery discharge and grid-connection operation with load; and the working conditions of the system are reasonably switched by adopting a proper energy management policy based on the output power of the photovoltaic module, the storage battery SOC and the load conditions so as to ensure the smooth operation of the system.