A solvothermally synthesized photoactivatable Pt(IV)‐coordinated carbon dots (Pt‐CDs) and their bovine serum albumin (BSA) complex (Pt‐CDs@BSA) as a novel orange light‐triggered anti‐tumour therapeutic agent with significant visible absorption exhibit excellent photocatalytic properties, which possess ultrastrong cancer cell killing capacities of intracellular cytotoxic Pt(II) species release, hydroxyl radical generation, and acidification, which induce powerful immunogenic cell death (ICD). Here, ALB is linked to neoplasm.