The invention discloses an oat-shrimp cake capable of tonifying the spleen and nourishing the heart and a preparation method thereof. The oat-shrimp cake capable of tonifying the spleen and nourishing the heart is prepared from the following raw materials in parts by weight: 4-5 parts of hemistepta lyrata, 3-4 parts of oat, 7-8 parts of snow pear, 1-2 parts of radix ginseng, 1-2 parts of fingered citron, 1-2 parts of pumpkin leaves, 200-210 parts of shrimp mince, 80-90 parts of frozen surimi, 20-25 parts of garlic juice, 18-20 parts of garlic powder, 15-18 parts of minced garlic, 0.3-0.4 part of nisin, 10-12 parts of table salt, 18-20 parts of soybean oil, 12-15 parts of white granulated sugar, 10-12 parts of egg liquid, 5-6 parts of cassava starch, 3-4 parts of soybean protein isolate, a proper amount of breadcrumbs, a proper amount of plant oil and a proper amount of water. The preparation method comprises the following steps of: pulping the snow pear into pulp, filtering the pulp, taking juice, stewing the oat in the juice, performing pulping into pulp, chopping the hemistepta lyrata, mixing the chopped hemistepta lyrata with the oat pulp, grinding the mixture into juice, and performing spray-drying, and taking powder. The oat is capable of tonifying the spleen and nourishing the heart and is soaked with snow pear juice, so that the oat-shrimp cake is moderately sour and sweet in taste, and fresh and delicious in taste.