A fence vegetation barrier assembly for inhibiting vegetation from growing beneath a fence includes a plurality of panels that is each elongated. Each of the panels is positionable beneath a fence having each of the panels extending between a respective pair of fence posts to inhibit vegetation from growing beneath the fence. A plurality of first trim units is each coupled to a respective one of the panels. A plurality of second trim units is each coupled to a respective one of the panels. Each of the second trim units engages the first trim unit on an adjacent one of the panels when the panels are positioned beneath the fence to enhance the visual appeal of the fence posts.