It relates to a liquid-liquid separator with concentrator bowl that have liquid inlet and outlet and partition plate, inward ball float valve on the bowl wall that can generate centrifugal force. It can allow fluids of varied density entering into the concentrator bowl, with bigger density liquids closer to the bowl wall with the centrifugal force produced when the inward floating force is biggerthan the weight of the floater in fluids of varied densities, with the floater moving inward, opening the channel and exhausting the deposit heavy media out of the device on the wall, realizing automatic separation.