The invention provides a rubber anti-reversion agent 1, 3-bis(maleimido)-n-propane and a synthesis method thereof, and the synthesis method comprises the following steps: step 1, adding 1,3-propanediamine and a solvent acetic acid into a reaction kettle together, additionally taking acetic acid to dissolve maleic anhydride, slowly dropwise adding a maleic anhydride solution in a stirring state, and carrying out a heat preservation reaction; step 2, after the heat preservation reaction is finished, adding a catalyst and a dehydrating agent into the reaction kettle, and carrying out acylation reaction; and step 3, after the acylation reaction is finished, centrifuging and filtering reactants, and washing and drying the filter cake to obtain the product. Relatively cheap 1,3-propanediamine isused as a reaction substrate, so that the production cost is saved; acetic acid is used as a solvent, a product obtained after acetic anhydride dehydration is also acetic acid, a reaction solvent canbe directly collected through a centrifugal method, a filtrate can be directly applied to next synthesis without treatment, and material waste and generation of a large amount of wastewater are alsoavoided.