Abstract: A transparent film projector includes a projector frame provided inside with all the components. A plurality of chain wheels are provided inside the projector frame for an annular chain strap to extend around. The annular chain strap is provided at the inner side with plural extension plates respectively having an extension strip fixed at the outer side and an orienting member secured at the inner side, and the extension strip has its outer end clasped by a spring. The orienting member is positioned at the inner side of an orienting rail, which guides the orienting member to move in a fixed direction so as to make the transparent films move smoothly. Besides, each transparent film has its opposite ends respectively hooked by the spring, so it can be flattened to move smoothly and replaced conveniently.