Photoreforming plastic waste into valuable chemicals while simultaneously splitting water to produce hydrogen (H2) under mild conditions presents a sustainable strategy to address environmental issues and generate solar fuels. Herein, we report a MoS2/CdS heterojunction photocatalyst synthesized via a one-pot solvothermal method for plastic reforming and H2 production. The strong Mo-S-Cd interaction at the interface creates a robust internal electric field (IEF), which promotes efficient charge carrier separation. The macroscopic asymmetry of tipping growth of MoS2 on one end of CdS nanorods further promotes imbalanced charge carriers' distribution and increased charge population. As a result, the IEF and structural asymmetry ensure electron migration from MoS2 to CdS for proton reduction to yield H2, leaving oxidative holes in MoS2 to drive poly(lactic) acid (PLA) reforming. Under visible light irradiation, the catalyst achieved a high H2 production rate of 97.7 mmol g-1 h-1 without using cocatalysts or sacrificial agents. Concurrently, MoS2/CdS converted PLA into lactate and pyruvate. This dual-function catalyst demonstrates exceptional promise for sustainable H2 production and plastic waste upcycling.