Cotton field water-saving irrigation system based on mains supply complementary photovoltaic power supply

The invention discloses a cotton field water-saving irrigation system based on commercial power complementary photovoltaic power supply. The cotton field water-saving irrigation system comprises a commercial power complementary photovoltaic power supply system, an information detection system, a valve driving control system, an electric valve and a remote monitoring center, the commercial power complementary photovoltaic power supply system comprises a commercial power supply module, a photovoltaic power supply module and a power supply switching module. The information detection system comprises a soil humidity sensor, a flow meter, an RS485 to serial port UART module, an information acquisition microcontroller and an NB-IoT wireless communication module; the valve driving control system comprises a touch screen, an RS232 to serial port UART (Universal Asynchronous Receiver/Transmitter) module, a central microcontroller, an NB-IoT (Narrow Band Internet of Things) wireless communication module and an optocoup