The invention discloses a preparation method for a metal-ceramic composite tube, which comprises the steps of: 1, removing the oil stain of the inner wall of a metal tube; 2, removing the roll scale of the inner wall of the metal tube and exposing a fresh metal substrate; 3, filling the mixture of powder-shaped ceramic grains and a pyrophorus in the metal tube; 4 sealing the two ends of the tube the inside of which is fully filled with the ceramic grains and the pyrophorus, wherein one end of the tube is provided with a fuse lead in wire and the other end is provided with a waste gas exhaust hole; the fuse lead in wire and the pyrophorus are communicated; 5, clamping the metal tube and leading the metal tube to rotate at a certain rotational speed; 6, igniting the fuse lead in wire and then using the fuse lead in wire to ignite the pyrophorus to burn and give out heat to fuse the powder ceramic grains in the tube to be in a shape of a liquid which is closely adhered to the inner wall of the tube under the effect of a rotating centrifugal force and uniformly coated on the inner wall of the tube; and 7 grinding and finishing the inner hole of the tube. The method uses the heat generated by self-propagating combustion reaction to fuse the ceramic materials; the rotating centrifugal force leads the solid materials to be closely adhered to the wall of the tube to form a firm inner wall melting ceramic layer, thus ensuring the ceramic layer not to fall off in longer use and prolonging the service life of the ceramic layer.