The invention belongs to the technical field of organic photoelectric materials and particularly relates to a dithienocyclopentadiene derivative and a preparation method thereof. The dithienocyclopentadiene derivative has the structural formula shown in the formula, wherein, R and R' represent C1-C20 alkyl groups, C1-C10 alkyl-substituted phenyl or C1-C10 alkyl-substituted thienyl. The preparationmethod comprises dissolving 2-bromothiophene, methyl 3-thiophene carboxylate and a base in an organic solvent, carrying out backflow for a reaction under action of a metal catalyst for 24h, carryingout a reaction process on the solution and an organometallic reagent, and carrying out ring closure with a strong acid to obtain a dithienocyclopentadiene derivative with a yield of 78-86%. The preparation method has the advantages of novel and simple processes, high yield and product separation and purification easiness. The dithienocyclopentadiene derivative contains multiple condensed rings, has strong conjugacy and can be used in the field of organic photoelectric materials.