Nowadays, the lack of water resources is mainly due to frequent industrial discharge of dyes wastewater such as azo dyes, so the demand of photocatalysts with rapid degradation rate is growing. We report the synthesis of a new morphology of AgBr-loaded carbon nitride nanoparticles with hollow porous nanostructures, HCNS/AgBr, which was prepared by a hard-templating and the deposition-precipitation method. The morphology, surface elements and optical properties of the HCNS/AgBr hybrids were characterized using transmission electron microscopy (TEM), X-ray photoemission spectroscopy (XPS) and photoluminescence (PL) spectroscopy. Different mass ratios of HCNS/AgBr were prepared and HCNS/AgBr60 showed the highest photoactivity for Orange G (OG) dye degradation under visible light irradiation. Degradation efficiency was shown to reach 97% within 10 min, which could be attributed to the formation of a heterojunction structure and the high separation efficiency of holes and electrons, meanwhile the mechanism was evidenced by free radical and hole scavenging experiments. The results demonstrate the potential application of this new photocatalyst in the removal of dye from wastewater.