The invention discloses a preparation method for a metal glass composite pipe, which belongs to the technical field of preparation of composite pipes. According to the invention, a self-propagating aluminum thermal reaction of aluminum and iron oxide is taken as a processing technology; cryolite is added at first, so the reaction is allowed to be safely carried out in virtue of the dilution effect of cryolite, and the fluidity of a system is improved by using cryolite, thereby facilitating a fusion product to be evenly distributed on the inner wall of a hot-rolled seamless steel pipe under the action of centrifugal force; then a small amount of borax is added, which is favorable for discharging gas in the system in an adequate period of time, reducing the possibility of shrinkage formation, so the density of the inner wall of the product is improved and a smooth and bright glass layer is formed; finally, the inner wall of the hot-rolled seamless steel pipe is welded with the fusion product of the self-propagating aluminum thermal reaction, so good metallurgical bonding of the transition metal layer and the steel pipe is prepared; and thus, the metal glass composite pipe is prepared.