Modular switching power supply system for zero-carbon communication

The invention relates to a modular switching power supply system for zero-carbon communication. The modular switching power supply system comprises an alternating current input module, a photovoltaic power supply module, a direct current fan power supply module, a storage battery module, a rectifier module, a photovoltaic DC-DC module, a fan DC-DC module, a battery DC-DC module, a busbar power distribution module, a direct current power distribution unit and a monitoring module. According to the monitoring module,when the output voltage of the photovoltaic DC-DC module and/or the fan DC-DC module reaches a first preset voltage value, the photovoltaic DC-DC moduleand/or the fan DC-DC module supplies power to the communication equipment, the battery DC-DC module is started when the output voltage drops to a second preset voltage value, when the output voltage of the battery DC-DC module is reduced to a third preset voltage value, the battery DC-DC module is closed, the rectification module is started, and the p