The invention relates to an automatic flow diverging system for groundwater recharging of well groups. The automatic flow diverging system comprises a recharging water source, a power supply device, a power line, a water pump, a water conveying pipeline, recharging wells and a flow diverging controller, wherein the water pump is arranged inside the recharging water source, the power supply device is connected with the water pump through the power line, the water pump is connected with a plurality of recharging wells through the water conveying pipeline, branch pipes of the water conveying pipeline extend into the recharging wells, and the flow diverging controller is installed at the tail end of the water conveying pipeline. The flow diverging controller is utilized for automatically switching on or off an annular valve body by utilizing difference between the buoyancy of a floater and the gravity of a pouring weight body, the recharging water quantity can be adjusted, so that the recharging capability of different water conveying pipelines can be adjusted in a self-adaptive manner, and meanwhile, recharging water is prevented from overflowing the well so as to avoid the structure of the recharging well. The device has the advantages of simple principle, automatic adjustment, energy saving and the like, is suitable for the recharging of a groundwater source heat pump system and the recharging for source supplementation of a groundwater overdraft area and has good application prospect.