Combined oil-water separation device

A combined oil-water separation device comprises a container and a controller, a liquid-phase separation filter element is arranged in the middle in the container, a feeding pump is externally connected to the liquid-phase separation filter element, and the liquid-phase separation filter element is used for separating oil and water in oil-water mixed liquid; a one-way oil guide filter element is arranged on the upper portion in the container and used for enabling oily components to pass through in a one-way mode, a one-way water guide filter element is arranged on the lower portion in the container and used for enabling water components to pass through in a one-way mode, a water outlet pipe is externally connected with the one-way water guide filter element, and an electric control switch valve is installed on the oil outlet pipe. The one-way oil guide filter element is externally connected with an oil outlet pipe; a layered medium interface balance monitoring device is arranged in the middle of the container