The invention discloses a laser cladding rare-earth modified iron-based ceramic composite long-service-life high-wear-resistance corrosion-resistant marine equipment piston rod coating and a preparation process thereof. The coating comprises the following components of, in percentage by mass, 15%-19% of Cr, 1%-2% of Mn, 5%-8% of Mo, 1%-2% of W, 11%-16% of B, 2%-5% of C, 1%-3% of Si, 8%-10% of ceramic powder, 0.5%-2% of rare earth oxide powder and the balance Fe. By taking the coating as a cladding material, laser cladding is adopted to obtain the laser cladding rare-earth modified iron-based ceramic composite long-service-life high-wear-resistance corrosion-resistant marine equipment piston rod coating, the coating has excellent wear resistance and corrosion resistance, the coating is highin surface hardness, is strong in binding force with a matrix material, and can bear large loads, and the problems that an existing coating is easy to peel off and corrode and is used in the wearingenvironment are effectively solved; and the coating has the advantages that the production cost is low, the preparation method and process is stable, performance is stable, and the coating is suitablefor large-scale application on fresh water and marine equipment facilities.