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The generation of clean, renewable energy sources has been a hot research topic for the past decades. Photocatalysis is a plausible way to store intermittently available solar energy in chemical bonds. So far, many metal oxides, metal sulfides, metal complexes, and their composites have been investigated for their efficiency as visible-light photocatalysts. It is still of great interest and practical importance to develop a cost-effective visible-light-driven catalyst for artificial photosynthesis.Recently, metal halide perovskites (MHPs) have been actively investigated to exploit their excellent optical properties, such as high visible-light absorption coefficients, long-range balanced electron-hole transport, etc., in combination with the potential of cheap and easy fabrication processes. However, the instability of MHPs in a polar environment limits the potential for their application as photocatalysts. To overcome this instability issue, reactions are usually performed in non-polar or low polarity solvents or in strongly concentrated metal halide solutions, which reverses the decomposition. As a prominent representative, cesium lead halides (CsPbX3, X = Cl, Br, I) have been seen as potential candidates for photocatalysis. Also, composite materials construction strategies have been actively utilized to optimize the activity and stability of MHPs in polar solvents. So far, CsPbBr3-based composites have been generated through the post-synthetic combination of preformed CsPbBr3 with other stabilizing materials. However, the in situ synthesis of composite materials offers enhanced surface contact with potentially improved activity and stability. Therefore, the in situ construction of CsPbBr3-based composites, comprising a type-II heterojunction, has been mainly investigated here.