The invention discloses a healthy mooncake containing common seepweed herbs and a preparation method of the healthy mooncake, and relates to a mooncake. 2.5-3.5 parts by weight of common seepweed herb powder or common seepweed herb homogenate is added into mooncake fillings. Extremely green common seepweed herbs are acquired by elaborate modern processing, natural probiotic functional factors of the common seepweed herbs are reserved, the natural common seepweed herb powder or common seepweed herb homogenate is added into the mooncake fillings, a traditional mooncake achieves unique healthy functions of reducing blood glucose, cholesterol and blood pressure, resisting cancers, protecting livers and benefiting health and long life by the aid of the green common seepweed herbs, and nutritional components of the mooncake are added.