The invention discloses a valve seat ring of a novel structure. The valve seat ring comprises a seat ring body; a sealing belt is arranged at one end of the seat ring body, a die-casting bevel is arranged at the other end of the seat ring body; a vertically-arranged step surface is arranged between the die-casting bevel and the sealing belt; the two ends of the step surface are connected with oneend of the die-casting bevel and one end of the sealing belt correspondingly; a vertically-arranged demoulding cylindrical surface is further arranged on the position, at one end of the outer side ofthe die-casting bevel, on the seat ring body; and the demoulding cylindrical surface is connected with the other end of the die-casting bevel. The novel valve seat ring is simple in structure and convenient to machine, an auxiliary surface does not need to be machined on the valve seat ring, the number of special tools is decreased, the valve seat ring can be quickly pressed and mounted on an engine cylinder cover and effectively prevented from being loosened, and the characteristics of short machining time, low cost and convenient mounting are achieved.