Pyran units as a six-membered heterocyclic nonaromatic containing one sp3 hybridized carbon and an oxygen have been widely employed to exploit donor and acceptor materials, and excellent power conversion efficiencies (PCEs) can be achieved for polymer solar cells (PSCs). In this work, a dibenzopyran (DBP) building block and a benzodithiophene (BDT) derivative as donor unit were utilized to successfully prepare a novel donor–donor (D-D)-type wide bandgap polymer PBDBP. The polymer PBDBP possesses an ultra-wide optical bandgap of 2.18 eV due to the weak intramolecular charge-transfer effect. Meanwhile, a low-lying HOMO energy of −5.41 eV is achieved, which is beneficial to realize a high Voc. Additionally, PBDBP also exhibits a complementary absorption with a narrow bandgap Y6 ranging from 300 to 950 nm, which can facilitate to improve light-harvesting ability for high Jsc. Finally, PBDBP:Y6 based device exhibits a high PCE of 11.43 % (Voc = 0.89 V, Jsc = 23.14 mA/cm2, and FF = 55.66 %). Our research indicates that the D-D-type polymer PBDBP based on dibenzopyran unit is a promising wide bandgap donor material for PSCs.