Valve ball type floor drain against return of waste water

The utility model relates to a valve ball type floor drain against return of waste water, belonging to the house launching element. The device comprises a floor drain outer shell 5 and an upper cover 1; the inside of the valve ball cover has a valve ball 3; the valve ball has a guide rod 6; a water guide pipe 2 is fixed on the upper cover 1; the lower part of the upper cover in the floor drain outer shell is fixedly connected with a valve ball cover 4 so that the valve ball 3 is in the valve ball cover; one end of the water guide pipe is arranged in the valve ball cover. The utility model has the advantage of the novel structure and the prevention of the sewage from returning upward.