The invention relates to a curved saw wheel steamer which is provided with a round power wheel, wherein the center of the power wheel is fixedly matched with a wheel shaft, the power wheel is pivoted in the outer casing, and the circumference of the outer casing is provided with a steam inlet port and a steam discharge port, wherein one end of the wheel shaft passes through the center of one side of the outer casing, and a torque is output outwards through the rotation of the end; the middle part of the external part of the power wheel is provided with a plurality of curved concave and convex saw teeth, when the power wheel rotates under the action of steam, the front concave curved surfaces of the curved concave and convex saw teeth apply work under the momentum of the steam, and the back convex curved surfaces of the curved concave and convex saw teeth can reduce the drag produced by steam discharge after work application. The curved saw wheel steamer can still obtain high driving force under the driving of low-pressure steam, and has high power-generating efficiency.