The invention relates to a tender lotus root preservative and a method for preserving a tender lotus root by using the same. The preservative is a mixed liquid which contains citric acid, vitamin C and calcium chloride in water. The method for preserving the tender lotus root comprises the following steps of: washing the tender lotus root; removing the head and the tail of the tender lotus root; placing the tender lotus root in an environment at the temperature of between 1 and 8 DEG C; bagging or canning after mixing the tender lotus root and the tender lotus root preservative; and performing microwave sterilization. The tender lotus root preservative does not add any component or material harmful to a human body, has extremely high safety, overcomes the defect that the tender lotus rootis softened by using conventional thermal sterilization technology by using preservative preserving and microwave cold sterilization technology, maintains specific crispness, color and luster of the tender lotus root to the maximum, and prolongs the preservation period of the tender lotus root greatly. The tender lotus root preserved by using the method has the characteristics of good mouthfeel, good color and good crispness, rich nutrient, contribution to human body digestion, absorption and utilization, convenient carrying and preservation, and preservation period up to 6 to 12 months, and particularly meets the requirement of people on eating the tender lotus root which has good crispness, color and taste all the year round.