The invention discloses a traditional Chinese medicine tablet for regulating blood sugar and a preparation method thereof. The traditional Chinese medicine tablet is prepared from the following raw materials in parts by weight: 15-20 parts of cassia seeds, 10-15 parts of rhizoma polygonati, 8-14 parts of boxthorn leaves, 10-15 parts of hawthorns, 6-12 parts of radix notoginseng, 9-16 parts of radix puerariae, 5-10 parts of folium mori, 8-14 parts of gymnema sylvestre schult, 10-15 parts of rhizoma dioscoreae, 12-16 parts of poria cocos, 15-20 parts of stevia rebaudian leaves, 10-15 parts of radix astragali, 16-22 parts of cape jasmine, 10-15 parts of rhizoma coptidis, 5-10 parts of radix salviae miltiorrhizae, 10-15 parts of Niu Gengcao, 5-10 parts of radix rehmanniae, 14-18 parts of rhizoma anemarrhenae, 10-15 parts of cedrela sinensis, 5-10 parts of radix polygonati officinalis, 10-15 parts of herba agrimoniae, 5-10 parts of fructus hordei germinatus, 10-15 parts of rhizoma alismatis, 12-16 parts of platycodon grandiflorum, 14-18 parts of gynostemma pentaphylla, 10-15 parts of polygonum multiflorum. The drug disclosed by the invention can be used for effectively regulating the blood sugar content, reducing the blood sugar, achieving an outstanding effect on treating diabetes and preventing hyperglycemia, has the advantages of definiteness in drug effect, quick effect taking, short treatment course, no bounce or side effect and wide application prospect and is worthy of being clinically popularized.