The invention provides a shaddock cake, which contains the following raw materials: shaddock, glutinous rice flour, buckwheat flour, sagittaria sagittifolia, sweet osmanthus, bunge corydalis herb, coralhead plant stem with leaf, orange peel, purified water, a sweetener, sunflower oil and sesame powder. A processing method of the shaddock cake comprises the following steps: (1) preparing shaddock pulp for later use; (2) preparing a nutrient solution; (3) preparing mixed liquor; (4) mixing glutinous rice flour and buckwheat flour, adding shaddock pulp, mixed liquor and sunflower oil into the mixture, stirring and mixing, pouring the mixture into a mould and steaming; and (5) rolling the steamed cake with sesame powder, sterilizing and packaging in vacuum so as to obtain a finished product. By using shaddock pulp as a raw material of the cake and adding nutrient components such as sagittaria sagittifolia, buckwheat flour, sweet osmanthus and the like, the cake is crispy and tasty, has long aftertaste, and has health-care effects of increasing appetite, promoting digestion, nourishing stomach and strengthening body, etc. The technology of the invention is simple, has advantages of less investment and fast effectiveness, and is easy to realize standardized production.