The invention relates to a homo-polypropylene/carbon fiber/montmorillonite composite material and a preparation method of the homo-polypropylene/carbon fiber/montmorillonite composite material. The homo-polypropylene/carbon fiber/montmorillonite composite material is prepared from the following raw materials in parts by weight: 85 to 95 parts of homo-polypropylene, 5 to 10 parts of carbon fibers, 2 to 3 parts of organic montmorillonite, and 3 to 5 parts of foaming masterbatches, the foaming masterbatches are prepared from the following raw materials in parts by weight: 60 to 70 parts of polyethylene, 20 to 30 parts of foaming agents, 1 to 3 parts of foam stabilizers, 3 to 5 parts of nucleating agents, 0.5 to 1.5 parts of zinc oxide, 0.5 to 1 part of a titanate coupling agent NDZ-201, 3 to 5 parts of PE wax and 0.5 to 1 part of zinc stearate. According to the homo-polypropylene/carbon fiber/montmorillonite composite material disclosed by the invention, the mechanical properties are excellent, the tensile strength reaches 36.9 MPa, the impact strength reaches 55.1 kJ/m<2>, and the flexural modulus reaches 1590 MPa. The foaming material has best foaming and biggest cell density, the cell density reaches 2.3*10<7>/cm3, and the porosity of the foaming material is 17.7%.