The invention discloses a method for producing 5-norborene-2,3-diformic anhydride, and belongs to organic chemical synthesis field. The method comprise the following steps: taking maleic anhydride and mixed C5 as raw materials, directly absorbing cyclopentadiene by the maleic anhydride for reaction at 0-5 DEG C to generate nadic anhydride, and then crystallizing the nadic anhydride to obtain a purified product. Compared with the prior art, the method is characterized by taking cheap ethylene by-product (the mixed C5) as the raw material for preparing the nadic anhydride, and simultaneously obtaining a chemical raw material (decyclized C5), thus enhancing deep-processing application of the mixed C5, and providing great application value.