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A plant needs sunlight, carbon dioxide, minerals and water to make food. A green substance in plants called chlorophyll traps the energy from the Sun needed to make food. Chlorophyll is mostly found in leaves, inside plastids, which are inside the leaf cells. The leaf can be thought of as a food factory.
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Leaf is called food factory of the plant because they only contain chloroplast in which chlorophyll is present and photosynthesis takes place in that part only. they prepare food in the presence of  sunlight by the process of photosynthesis. the food fron the leafs goes in all the plant body. so they are known as food factory of the plants.