Oil tank wastewater collection device

The utility model discloses a waste water collecting device of an oil tank. The device comprises a wastewater tank and a water collecting tank, a fixing clamp is fixedly mounted on the outer surface of one side of the wastewater tank; a liquid level meter is fixedly mounted on the outer surface of the fixing clamp; a fixed frame is fixedly mounted on the outer surface of the lower part of the wastewater tank; the outer surface of the lower end of the wastewater tank is fixedly connected with a connecting pipe; a water inlet is formed in one end of the water collecting tank; a water outlet is formed in the other end of the water collecting tank; an isolation tank, an oil discharge tank and a sedimentation tank are arranged in the water collection tank; the isolation pool is located on the side, close to the water inlet, in the water collection tank, the oil discharge pool is located in the middle in the water collection tank, the sedimentation pool is located on the side, close to the water outlet, in the wate