The invention discloses foamed ceramic and a preparation method thereof, which belong to the ceramic and technical field of preparation. The foamed ceramic is prepared by using a precursor for dipping a slurry, wherein the precursor is melamino-formaldehyde foam, and the slurry comprises the following raw materials by weight percentage: 40-60% of silicon carbide micropowder, 3-5% of bentonite, 1-3% of powdered steatile, 3-5% of borate, 1-3% of resole, 0.5-1.5% of a fluidization agent, 0.5-1.5% of an antifoaming agent, 0.5-1.5% of a flocculating agent, and the balance of water. The invention also discloses a preparation method of the foamed ceramic. The method takes melamine resin foam as the precursor, the unit weight of the prepared foamed ceramic is 0.5-0.7 g/cm<3>, the integral opening percentage is 75-85%, the intensity can reach 6-7 MPa, performance is stable, and the foamed ceramic is an ideal foamed ceramic sound-absorbing material.