The invention discloses a compound apigenin nanoemulsion antihypertensive drug which comprises the following raw materials in mass percent: 1-15% of apigenin, 5-35% of surfactant, 1-20% of cosurfactant, 1-20% of oil, 0.5-10% of motherwort fruit aqueous extract, 0.5-10% of semen cassiae water extract and the balance of distilled water; and the sum of mass percents of the above raw materials is 100%. The nanoemulsion is small in emulsion droplet, uniform in distribution, low in viscosity and good in liquidity. After apigenin is prepared into a nanoemulsion, blood brain barrier transmission capacity is obviously increased, the bioavailability of a technical material is obviously improved, the half-life period of the drug can be prolonged; and the drug administration times can be reduced; with adoption of the nanoemulsion, the dissolution and infiltration capacity of atenolol can be improved and the stability of apigenin is increased; and the nanoemulsion has obvious synergistic effect compounded with the motherwort fruit and the semen cassiae; and the medicinal cure effect can be more fully played.