The invention discloses fresh spirulina ice cream and a preparation method thereof. The fresh spirulina ice cream is prepared by adopting sanitary and pollution-free fresh spirulina, a sweetening agent, vegetable oil, eggs, a stabilizing agent, an emulsifying agent, table salt and water as ice cream raw materials, adopting step heat treatment sterilization and low-pressure and low-temperature homogenization, and performing milk preparation, homogenization, sterilization, aging and congelation processes. The obtained ice cream keeps fresh spirulina cells stable, and phycocyanobilin does not leak. The fresh spirulina ice cream prepared by the method not only retains the special flavor of fresh spirulina, but also has complete nutritional ingredients and delicious taste. The fresh spirulina ice cream keeps the effects of relieving summer heat and regulating physiological functions of ice cream, also exerts the nutritional and health-care effects of spirulina, and has the effects of regulating metabolism and enhancing immunity. Compared with common dry powder spirulina ice cream, the ice cream has great breakthrough in the aspects of appearance, taste and nutritional value.