A PPY/Ti3C2Tx-AE double-layer anticorrosive coating is well-designed and prepared to enhance the corrosion resistance of 304SS BPs. Display omitted •A PPY and Ti3C2Tx-acrylic epoxy double-layer coating was prepared on 304SS BPs.•The isolation by PPY avoids the galvanic corrosion after the damage of T-AE.•The double-layer coating has both anodic protection and enhanced barrier effect. Stainless steel (SS) is a promising material for designing bipolar plates (BPs), but their further application is limited by serious corrosion problems in the acidic environment. Ti3C2Tx is expected to be used for SS BPs coatings, while galvanic corrosion will occur after the damage of Ti3C2Tx coating. Herein, a PPY/Ti3C2Tx-AE double-layer coating (DC) is well-designed and prepared on 304SS BP, which is composed of an inner electropolymerized PPY layer and an outer Ti3C2Tx-acrylic epoxy layer. When tested in 0.2 M HCl solution, the corrosion potential and corrosion current density of the DC are 38 mV and 0.00927 μA cm−2 respectively, which are superior to those of the PPY coating and the Ti3C2Tx coating. Moreover, the DC presents the best long-term stability among the three coatings. The excellent corrosion resistance is attributed to the barrier and anodic protection effects as well as the solution of galvanic corrosion. The new coating system provides a new insight into the design of DC coatings of SS BPs.