The invention discloses an automatic balanced type water-diversion pivot which comprises a free-flow tunnel, a diffusion section and a water-diversion front pool section, wherein water is transported to the diffusion section after being taken from a reservoir at one end of the free-flow tunnel; one end of the diffusion section is connected with a tunnel outlet of the free-flow tunnel; the other end of the diffusion section is connected with the water-diversion front pool section; and the water-diversion front pool section is composed of a water-diversion weir used for water diversion. The automatic balanced type water-diversion pivot can automatically distribute water quantities required by different target units, ensures a water flow to smoothly enter a pipeline and can also eliminate eddies and filter a water source.