The invention discloses a carbon nano tube toughened SiBCN(O) metal-based ceramic coating and a preparation method thereof. The preparation method comprises the following steps: ammonolyzing vinyl chlorosilane and phenyl chlorosilane with ammonia, and then carrying out reaction for 1 to 3 hours; removing a solvent through evaporation, thus obtaining liquid polysilazane, and dropwise adding boranedimethyl sulfide for continuous reaction, thus obtaining polyborosilazane; dropwise adding a carbon nano tube solution into the polyborosilazane solution, and carrying out stirring, thus obtaining polymer slurry; coating the surface of a matrix with the slurry, and carrying out pyrolysis at high temperature to obtain the SiBCN(O) metal-based ceramic coating. According to the carbon nano tube toughened SiBCN(O) metal-based ceramic coating disclosed by the invention, the polyborosilazane synthesized by the vinyl chlorosilane, the phenyl chlorosilane and the borane dimethyl sulfide is used as a raw material, and carbon nano tubes are added to prepare the slurry; after immersion coating is carried out, high-temperature pyrolysis is carried out, thus obtaining the high-temperature-resistant andcorrosion-resistant ceramic coating. The process is easy to operate, and the sintering temperature is low; the energy consumption is reduced, and the cost is saved.