The invention relates to slope treatment, in particular to a frame beam unit for slope reinforcement and an assembled frame beam. The frame beam unit for slope reinforcement comprises a center plate and three or more supporting beams, wherein the surface of the center plate is provided with an anchor hole, and the supporting beams are distributed at the periphery of the center plate, fixedly connected with the center plate, and used for being connected with supporting beams of other frame beam units, so that grille structures are formed between the frame beam units; and the supporting beams are provided with connecting parts used for being connected with protection nets used for being arranged at hollow grooves of the grille structures. The multiple frame beam units are assembled so that the frame beam unit used for slope reinforcement and having a high protection effect can be formed, the structure is simple, and mounting is convenient. The assembled frame beam comprises the multiplegrille structures used for being distributed on the reinforcement mounting face, and the protection nets are arranged in the hollow grooves of the grille structures, wherein the edges of the protection nets are connected with the hollow grooves; and each grille structure is formed by the three or more frame beam units in an assembled mode, wherein the frame beam units are used for being distributed on the reinforcement mounting face.