The invention relates to the technical field of 
health food, and in particular, discloses a 
moringa oleifera oral liquid and a preparation method thereof. The 
moringa oleifera oral liquid is prepared by inoculating a 
moringa oleifera extract liquid with 
kombucha and then fermenting, wherein the 
fermentation temperature is 25-35 DEG C and the 
fermentation time is 48 h-72 h; according to the 
mass of moringa oleifera leaves used during preparation of the 
moringa oleifera extract liquid, the volume of an inoculated 
kombucha liquid corresponding to each 
gram of the moringa oleifera leaves is 20-30 ml; the number of live 
acetic acid bacteria in the 
kombucha liquid is greater than or equal to 1*10<5> / ml; the number of live 
yeast is greater than or equal to 1*10<8> / ml. The kombucha in the oral liquid strongly inhibits growth of 
pathogenic bacteria, promotes 
digestion, relaxes the bowels and expels 
toxin, makes the health of digestive systems of sub healthy people restored, promotes the absorption of nutritive health-care components of moringa oleifera, and improves the antihypertensive, hypolipidemic and hypoglycemic health-care effects of moringa oleifera. The preparation method of the moringa oleifera oral liquid has the advantages of simple operation, easy implementation, and convenience in industrialized popularization and application.