The invention provides lotus seed puffed food and a preparation method. The lotus seed puffed food is mainly puffed and made from mixed powders which are composed of the components by mass percent as follows: dry lotus seed powders are 20 percent to 50 percent, rice flours are 10 percent to 50 percent, corn meals are 0 percent to 40 percent, soybean flours are 0 percent to 30 percent, and mushroom powders are 0 percent to 5 percent. The invention has the preparation method that the dry lotus seeds prepared by a traditional drying method or fresh lotus seeds after being freeze-dried in vacuum are used as raw ingredient, corns, rice, mushrooms and beans are used as auxiliary ingredients, the raw ingredient and auxiliary ingredients are crushed into 40 to 80 screen meshes, or are added with seasoning for flavor treating, and then a puffed twin-screw extruder is adopted for extruding and puffing to manufacture the lotus seed puffed food.