The invention relates to an oil smoke separating device and a range hood provided with the same. The oil smoke separating device comprises a main shell, at least one rotational flow structure and a spraying structure, wherein the main shell is provided with a separation channel with an air inlet and an air outlet, at least one rotational flow structure is located in the separation channel and islocated between the air inlet and the air outlet, and at least one rotational flow structure can provide centrifugal force which is deviated from the center of the separation channel from the lampblack flowing from the air inlet to the air outlet; and the spraying structure is positioned on the separation channel and is positioned between the rotational flow structure and the air outlet. Accordingto the oil smoke separating device, a cyclone structure is utilized to enable oil smoke to form a rotational flow, and meanwhile, oil drops are condensed by the spraying structure, so that the oil drops are effectively separated from the smoke, and meanwhile, soluble organic gas in the oil smoke can be effectively removed, so that the increasingly strict oil smoke emission standard is met; and the interior of the range hood with the oil smoke separating device does not easily remain oil, so that the service life of the range hood is prolonged.