Grain steaming machine

The invention provides a grain steaming machine which comprises a water returning case connected with a steam collecting port with an opening facing downwards, and also comprises at least two grain steaming devices which are parallel to each other up and down and are disposed below the water returning case; the grain steaming device orderly comprises, from up to down, a water supplementing pipe and a conveyer belt; a conveying channel is disposed on the upper surface of the conveyer belt; a steam pipe with steam holes is disposed in the conveyer belt; the water supplementing pipe is provided with a water supplementing nozzle and is communicated with the water returning case; the steam pipe is connected with an external steam generation device; the conveyer belt is connected with a power mechanism in a driving manner. With the above scheme, a traditional horizontal grain steaming machine is changed into a vertical multilayer device which heated grains layer by layer by using the upward transpiration of steam,