The invention relates to an optical fiber image transmission element. The optical fiber image transmission element comprises at least three optical fibers which are tightly stacked in parallel; each optical fiber comprises a fiber core and a cladding positioned on the outer side of the fiber core; the refractive index of each fiber core is larger than that of each cladding; each cladding containsmetal elementary substances; and the inner surface, in contact with each fiber core, of each cladding does not contain the metal elementary substances. The invention further provides two preparation methods for the optical fiber image transmission element. The metal elementary substances are introduced in a cladding glass material of each optical fiber; the distribution of the metal elementary substances in each cladding is controlled, so that the outer surface of each cladding contains the metal elementary substances, but the part, close to each fiber core, of the inner surface of each cladding does not contain the metal elementary substances; and the structure of each cladding not only can ensure that light can be totally reflected in each fiber core, but also can absorb non-effective light entering a cladding region, so that stray light is prevented from being formed to enter each fiber core again to influence the performance of an optical waveguide, and the obtained optical fiber image transmission element has relatively high definition.