A method of electroless nickel plating on surface of silicon carbide powder with a uniform and stable coating. In this method, ultrasonic assist is introduced in the pre-treatment and during plating process, and the powder particles in the liquid are dispersed and deagglomerated by the mechanical action and cavitation of the ultrasonic waves, thereby achieving a uniform dispersion of the powder in the dispersant. Furthermore, a reducing agent is slowly added during plating so as to give a more uniform and stable deposition of the coating onto the surface of the powder particles, and thus a silicon carbide core-nickel shell structure with an excellent powder dispersibility and a uniform and stable coating is produced.