The invention provides an ironic sulfide compound film and a preparation method thereof. The preparation method comprises the following steps: placing an iron source and a sulfur source in an upstreamzone of a tubular furnace, and placing a pretreated substrate in a downstream zone of the tubular furnace; in a protection gas atmosphere, gasifying the iron source and the sulfur source at 190-200 DEG C, receiving precipitate of the substrate within 375-575 DEG C, and keeping the temperature for 180-240 minutes, thereby obtaining an ironic sulfide compound film from the substrate, wherein the mole ratio of the iron source to the sulfur source is (1:1)-(1:2), and the flowing speed of a protection gas is 190-210sccm. By adopting the preparation method, ironic sulfide compound films of ferroussulfide, pyrite, pyrrhotite and the like are produced in a large scale at one time by using a chemical vapor deposition method and a large-capacity quartz tube, in addition, a corresponding ironic sulfide compound film is directly synthesized on conductive glass (FTO), the reaction tediousness is greatly reduced, and synthesis steps are simplified.