The invention discloses a high strength cable protective pipe, and a preparation method thereof, and belongs to the field of cable protective pipe. The high strength cable protective pipe comprises, by weight, 80 to 90 parts of polypropylene, 15 to 20 parts of low density polyethylene, 3 to 7 parts of maleic anhydride grafted polypropylene, 5 to 10 parts of castor oil, 15 to 20 parts of nanometerlight calcium carbonate, 6 to 12 parts of nanometer mica, 3 to 7 parts of nanometer zinc oxide, 5 to 10 parts of hollow glass bead, 6 to 12 parts of modified boron fiber, 3 to 7 parts of modified nanometer titanium dioxide, 1.2 to 2.6 parts of a cross-linking agent, 1.6 to 3.2 parts of an anti-oxidant, and 2.4 to 3.8 parts of a fire retardant. The high strength cable protective pipe is provided with excellent weatherability, thermal tolerance, corrosion resistance, fracture resistance, compression resistance, and mechanical impact resistance because of the cooperation of the raw materials; theraw materials are widely available; and the preparation method is simple.