The invention provides an amorphous material with an equal atom mol ratio and a preparation method thereof and belongs to the technical field of preparation of amorphous materials. The amorphous material is prepared from four types of oxide including lanthanum trioxide, titanium dioxide, niobium pentoxide and tungsten oxide and the atom mol ratio is as follows: La accounts for 25 percent, Ti accounts for 25 percent, Nb accounts for 25 percent and W accounts for 25 percent; the preparation method comprises the following steps: 1) mixing the raw materials according to the equal atom mol ratio; drying, pre-firing and carrying out tabletting to prepare a mixed oxide blank; 2) putting the block-shaped blank into a laser suspension furnace and melting a block through laser; then rapidly coolingto room temperature. According to the amorphous material provided by the invention, oxide mixed powder is suspended in the air in a melting, rapid cooling and condensation process and is not in contact with any container; in a cooling process, no heterogeneous nucleation is formed, so that the formation of the amorphous material is facilitated; impurity elements cannot be introduced and the purityof the amorphous material is kept.