The utility model relates to a compound water oil separator used for an overland processing station and an offshore oil production platform. The compound water oil separator has the technical proposal that a liquid inlet and a liquid outlet of a current divider are respectively communicated with a horizontal main liquid pipe, a vertical tube, and a lower horizontal pipe; the vertical tube is communicated with a bent pipe; the lower horizontal pipe is connected with the input port of a helix tube which is connected to a fourth separator box body, the helix tube is communicated with a second settlement separator box body, the top part of the helix tube is communicated with the top part of a fourth settlement separator box body through a middle pipe; horizontal drain pipes are arranged on an outlet at the bottom of the side wall of the fourth settlement separator box body corresponding to an inlet, and a horizontal oil exit pipe is arranged at the top part thereof, one end of the horizontal oil exit pipe passes through the bottom of a third settlement separator box body, and the other end is fixed with the outlet of the bottom of the third settlement separator box body; an upper horizontal pipe is communicated with a first helix pipe, the other outlet of which is connected to the third settlement separator box body, a pipeline is connected between the top parts and the bottoms of the first and the third settlement separator box bodies; exhaust pipes and production lines are arranged on the two horizontal drain pipes through a tee joint T.