We reported a broadband photodetector with a spectral range of 365-965 nm， based on a SnS₂/InSe vertical heterojunction. In this device， InSe serves as the optical absorption layer， effectively extending the spectral range， while SnS₂ functions as the transmission layer， forming a heterojunction with InSe to facilitate separation of electron-hole pairs and enhance the responsivity. The photodetector exhibits a responsivity of 813 A/W under 365 nm. Moreover， it still maintained a high responsivity of 371 A/W， an external quantum efficiency of 1.3 × 10⁵%， a specific detectivity of 3.17 × 10¹² Jones， and a response time of 27 ms under 965 nm illumination. The above investigation provides a new approach for broadband photodetectors with high responsivity.