Gravity flow type oil-water separator

The invention relates to a gravity flow type oil-water separator. The gravity flow type oil-water separator is characterized in that the gravity flow type oil-water separator comprises an oil-water mixing tank and a water separating tank, the sidewall of the oil-water mixing tank is provided with a water inlet, one side, opposite to the water inlet, of the oil-water mixing tank is fixedly connected with the water separating tank, the lower part of one side of the water separating tank is communicated with the oil-water mixing tank, the other sidewall of the water separating tank is provided with a water outlet, and the liquid level of the water inlet of the water-water mixing tank is higher than the liquid level of the water outlet of the water separating tank to form a gravity flow loop for treating a liquid level difference between inlet water and outlet water. The liquid level difference between inlet water and outlet water is changed to achieve the increase of the treatment throughput. The gravity flow ty