Visible-light-driven, graphene-like boron nitride (g-BN)-mediated graphitic carbon nitride (g-C3N4) photocatalysts were firstly synthesized via a facile and green method. The as-prepared catalyst samples were characterized by their morphology, optical and electrochemical performance. The photocatalytic activity of the g-BN/g-C3N4 composites was evaluated by bisphenol A photodegradation and H-2 evolution under visible-light irradiation. The results indicated that 0.9% g-BN/g-C3N4 exhibited the best photocatalytic activity amongst the hybrid photocatalysts. The enhanced photocatalytic activity was ascribed to excellent surface properties, an enhanced visible-light harvesting capability, a stable structure and a high-efficiency separation rate of photoinduced electron-hole pairs. This work will support the rational design of g-BN-based photocatalytic materials for use in energy conversion and environmental preservation.