The invention discloses a natural fruit and vegetable powder and a preparation method thereof, and belongs to the field of food processing. The natural fruit and vegetable powder comprises the raw materials: a citrus powder, a water chestnut powder, a grape powder, a zizania aquatica powder, a lemon powder, a carrot powder, a bitter gourd powder, a pumpkin powder, a tomato powder, sucrose, and auxiliary materials; the auxiliary materials comprise maltodextrin, lecithin, isolated soy protein and glucomannan. The natural fruit and vegetable powder is prepared through the steps of preparing a fine powder, batching, cooking thoroughly, drying, crushing and the like. The natural fruit and vegetable powder has the following advantages: the preparation process is simple, the added auxiliary materials promote fusion of various raw materials, all the components are allowed to be mixed and emulsified completely and uniformly, and the reconstituability of the natural fruit and vegetable powder is improved; at the same time, all the raw materials are interacted with each other, and the nutrition and health-care functions of the natural fruit and vegetable powder are strengthened.